Here's a few tips on how to approach a script for anyone constantly getting a writer's block over their projects:
Start with a very short pitch (one sentence, no more) and a concept (the way I will approach the story to make it "original").
Determine the main theme of the story. From this theme, create the final revelation, or choice that the character will have to face.
From thereon, outline the characters, start with the main character, then the main villain, then the secondary characters. EVERY character should be defined according to :
- Their needs
- Their weakness(es)
- Their desires (not the same as their needs, they might not know what their needs are, but will have desires nonetheless).
- Their opinion about the main theme.
- The way they will conflict with each other.
Create the universe as an arena. Is it large (a universe? The world?), medium-sized (a city? A neighbourhood?) or small (a house? An amusement park? etc etc.).
In this general arena, determine what places are worth visiting. If a place is attributed to a character in particular, then it should be created so as to reflect their personality, needs, desires, etc...
Determine the main steps of the story, or the major events. They usually go like this :
- Weaknesses and needs of the main character(s) - You establish who they are and how their lives are not fulfilled because of their situation/morals/way of living/etc...
- Problem - This is the most important thing to determine. WHat is the triggering event that will put this/these character(s) on the path to their new selves.
- Adversary and obstacles - who they are. Why are they adversaries. How they will try to prevent the main character to reach his/her goals.
- Main character's plan - What idea will they come up with to overcome their adversaries and obstacles.
- Final confrontation
- Choice (has to be related to the main theme)
- Revelation (the character(s), world(s) etc. is/are changed.
NB : The FIRST thing to determine is what the ending revelation will be. Whatever you do, do not ever get into a story without knowing what its outcome is. The best writers might be able to do it (Although I will argue that they always have at least an idea of what it will be), but usually inexperienced people start from the beginning and they will inevitably reach a point when they will ask themselves "OK, what now?" and stay stuck for days, weeks, months, years before they give up and either start it all over or move on to another project.
SYMBOLS : They are an essential part of moviemaking. Create/determine objects, colours, any symbol you can come up with that will add another layer to your story. There should be a general symbol representing the main theme or the overall story. Then, each main character should have not one or two, but dozens of symbols representing their personalities and conflicts. Attributes such as objects (DiCaprio's spinning top in Inception), the use of colours, etc. usually work very well.
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Once you're all set, it's time to outline the story as precisely as possible.
Here's how I do it :
Get as many pieces of paper as possible (make them 3"x2") and write your scenes ideas on each of them. Don't bother writing in chronological order, just stick as many ideas as possible on as many pieces of paper. One scene = one piece of paper.
If you're writing a feature-length film, try to have as many as 150 pieces of paper.
Once this is done, try to arrange them in chronological order in front of you. This is when you start to put together the structure of your story. Get rid of any piece of paper that you've written but that doesn't "fit" into the general scheme, or modify it so that it fits.
If you find out that there's a gap between two scenes, come up with a new scene that bridges it.
Whatever you do, there are two things you should ALWAYS go back to, no matter what : your theme and concept. If a scene does not relate to any of them, get rid of it.
I've seen a lot of young writers get into scriptwriting, and especially for Fanfilms. That's the thing they always get wrong. They go "I'm gonna create a Batman story with such villains. Batman's gonna do such kickass fighting moves and he's gonna hide in such cool place. Eventually they'll defeat the villain thanks to such trick, etc.
Those projects NEVER get made or they suck. The Dark Knight worked because Batman was faced with his greatest enemy : HIMSELF. The main theme of the story was (more or less) "how far will you accept to go to stop a limitless force?" It wasn't just a film depicting "Batman vs. The Joker". It was more like a "Batman vs. Batman because of the Joker" situation.
The most important thing in your story is a/Your character needs to have weaknesses, desires... b/He has to be challenged and c/He has to CHANGE. And those three basic steps should be intimately related to the main theme. If they aren't, you'll lose your grip on what you're writing, and be all over the place.
Hope that (long) post will be useful... Of course, none of this is set in stone, it's just the way I do things, but you may find out that you work better with another method, or by starting to develop your characters, etc. I only suggest that you try it, because it sure worked for me.