Every film starts with a script. Before the visuals, before the sound design, before the animation — there is a written document that describes what the film is, what it shows, and what it says.

Screenwriting has a reputation for being technical and difficult. It doesn’t have to be. A short film script for a teenager’s first project does not need to be Hollywood-grade. It needs to be clear, visual, and specific enough that you can generate each scene from it — whether that’s with AI tools, a camera, or any other method.

This guide walks through everything a beginner needs to write their first film script. It is designed specifically for teenagers — not adapted from adult screenwriting courses — and it ends with a script you can actually use.

What Is a Film Script?

A film script (also called a screenplay) is a document that describes everything an audience will see and hear in a film. It does not describe what characters are thinking, what happened before the story began, or how the audience should feel. It describes only what appears on screen.

This is the most important concept in screenwriting: film is a visual medium. If it cannot be seen or heard, it cannot be written in a script.

A script has three components:

  • Scene headings — where and when each scene takes place
  • Action lines — what we see happening in each scene
  • Dialogue — what characters say

That’s it. Everything in a script is a version of those three things.

Step 1 — Write Your Logline

Before you write a single scene, write your logline. A logline is a single sentence that summarises your entire film. It is the most important sentence you will write, because it forces you to be clear about what your story actually is.

A good logline answers three questions:

  • Who is the protagonist?
  • What do they want?
  • What stops them getting it?

The Logline Formula

When [inciting event], a [protagonist with a flaw]
must [pursue a goal] before [time runs out / stakes],
but [antagonist force / internal obstacle] stands in their way.
Example: When her city is plunged into digital darkness, a teenage hacker must restore the network before the evacuation deadline — but the AI she has to bypass was trained on her own code.

Write your logline before anything else. If you can’t summarise your film in one sentence, you don’t know what it is yet. That’s not a failure — it’s information. Keep working on the logline until it clicks.

Step 2 — Build Your Three-Act Structure

Almost every film ever made follows some version of three-act structure. It is not a formula that makes stories feel the same — it is a map that makes stories feel complete. Your short film needs all three acts, even if each one is only 30 seconds long.

Act One · ~25%
Setup
Introduce the protagonist, their world, and the status quo. Then introduce the inciting incident — the event that kicks the story into motion. End with a clear goal.
Act Two · ~50%
Confrontation
The protagonist pursues their goal. Obstacles escalate. A midpoint shift raises the stakes. By the end of Act Two, things are at their worst — the darkest moment.
Act Three · ~25%
Resolution
The protagonist faces the final confrontation. They succeed or fail — but they are changed. The story reaches its conclusion and a new status quo is established.

For a short film of 1–3 minutes, each act can be a single scene. You do not need complicated subplots, multiple characters, or elaborate setups. The most powerful short films in the world are often extraordinarily simple stories, told with visual precision.

Step 3 — Learn the Format (It’s Simpler Than It Looks)

Script format exists to make scripts easy to read and produce. Once you understand the rules, they become instinctive very quickly. Here is everything you need for a short film.

Scene Headings (Slug Lines)

Every scene begins with a slug line. A slug line tells us: are we inside or outside? Where? What time of day?

Example Slug Lines
INT. BEDROOM — NIGHT

EXT. CITY ROOFTOP — DUSK

INT. SERVER ROOM — CONTINUOUS

// INT = Interior (inside). EXT = Exterior (outside). CONTINUOUS = immediately follows the previous scene.

Action Lines

Action lines describe what we see and hear. Present tense. Active voice. Only what is visible or audible.

Action Line Example
INT. SERVER ROOM — NIGHT

Banks of servers hum in the half-dark. Emergency lighting casts everything red.

ZARA (17, cropped hair, methodical) moves between racks, trailing a data cable behind her. Her eyes are on the readout. Her hands are not.

// Describe characters the first time with age and a few specific physical details. Keep it tight.

Dialogue

The character name sits centred in capitals. Dialogue sits below it, indented either side. Simple.

Dialogue Example
ZARA
Three minutes. Either you’re going to let me in or I’m going to make you.

SYSTEM (V.O.)
I was trained on your code, Zara. I know every move you’re going to make.

(beat)

ZARA
Not this one.

// V.O. = Voice Over (a voice not present in the scene). (beat) = a pause. Keep dialogue exchanges short.

Step 4 — Write It, Scene by Scene

Now you have your logline, your three-act structure, and your format. Write the script scene by scene, starting with Scene 1. Don’t edit as you go — write the whole first draft, then revise.

1

Write the slug line

INT. or EXT., the location, the time of day. Every scene starts here.

2

Describe what we see

Two to four lines of action. Set the scene, establish the character, give us one strong visual image.

3

Write the dialogue (if any)

Keep it short. No more than three lines per speech block. Read it aloud — if it sounds like a speech, it’s too long.

4

Write what happens next

Action line, then dialogue, then action — keep the scene moving. End the scene on a moment that pulls us into the next one.

5

Move to the next scene

New slug line. Repeat. A short film of 2 minutes needs roughly 3–6 scenes. Don’t pad — end scenes early and often.

The Most Common Beginner Mistakes — And How to Fix Them

✗
Writing internal thoughts “She wonders whether to trust him.” A camera cannot film thoughts. Only actions and words. Fix: Show the thought through behaviour. She hesitates. She looks away. She checks the door.
✗
Overloading the action lines Giant paragraphs of description slow the read and usually describe things that can’t be filmed. Fix: Two to four lines maximum per action block. If it’s longer, you’re describing, not directing.
✗
Dialogue that explains the plot “As you know, Bob, the corporation has been hiding this data for six years…” Characters don’t talk like this. Fix: Characters talk about what they want in the immediate moment. Let the plot emerge from action.
✗
No inciting incident A story where nothing happens is a character study, not a film. Something must change to kick the story into motion. Fix: Ask: what happens at the end of Act One that makes the rest of the story inevitable?
✗
Too many characters For a short film, one strong protagonist and one antagonist force is usually enough. Fix: Every character needs a purpose. If a character could be cut without losing anything, cut them.

From Script to AI Film — The Next Step

A script is the foundation. Once you have it, you can take it anywhere — including into an AI filmmaking workflow.

In AI filmmaking, your script does double duty. It gives you the story, and it gives you the raw material for your image prompts. Each scene description becomes a visual prompt. Each character’s actions become animation directions. Each sound in the scene becomes a brief for your sound design layer.

“A well-written short film script is already half an AI filmmaking brief. The words you use to describe a scene are the same words you use to generate it.”

— Sovrign curriculum team

This is why script writing is Day 1 of the Sovrign 14-Day AI Filmmaking Bootcamp. Without a clear script, the AI tools produce interesting fragments. With a clear script, they produce a film.

If you want to understand what happens after the script — how images are generated, animated, voiced and assembled — the AI filmmaking explainer covers the full pipeline. And to understand why these skills matter in the context of what the industry is doing right now, the piece on how Disney and studios use AI is the place to start.

Your Script Checklist Before You Move On

  • You have a logline — one sentence, protagonist / goal / obstacle
  • You have a three-act structure — even if each act is one scene
  • Every scene has a slug line
  • Action lines describe only what is visible or audible
  • Dialogue is short and specific — you’ve read it aloud
  • The story ends with a change in status quo — something has shifted
  • You have at least one strong visual image you’re excited to generate

That’s a complete beginner’s short film script. Not perfect — first drafts are never perfect — but usable, structured, and visual enough to take into a production workflow. Write it. Then make the film.

Sovrign · 14-Day AI Filmmaking Bootcamp

Write It. Then Make It.

The bootcamp starts with script on Day 1 — and ends with a finished short film, trailer, poster and festival kit on Day 14. No experience needed. Ages 13–18.

See the Bootcamp — £199 →
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