Stick to the the hollywood formula, three act structure, stakes, first 15 pages, character arcs, the generic stuff that save that cat teaches you and studio readers will throw in the trash if you deviate an inch from.
Truthfully there isn't a final script writing format, it changes, it changed a few times since 2007, and still is because one studio will do one thing and it spreads like a wildfire to the others.
You can go against these rules if your say, George Miller, George Lucas or James Cameron.
George romero's dawn of the dead was over 750 pages long and written like a novel with characters talking in their head and such.
Spike lee ignores the generic hollywood formula for all his films.
Easy Riders was written on the fly and written on the spot for whatever locations the production crew stopped at.
If you're going to shoot the script yourself, you can write the script any hell way you want. The rules for script and making movies were retarded through the 40s and 60s, some were literally scriptments.
A handful of films that broke the rules then changed hollywood, and prob will happen again.
Anyway, final draft, any version above 7 is fine, everything's preset. Look up what a spec script is. And write a novel first, it'll help your writing skills in the long run, also less is more.
And read; "You're cut is showing" it'll explain to you what shit makes studio readers pissed off in amateur scripts.
