How To: Write a Screenplay
DYI Writes: A fictional movie needs a sort of blueprint that the cast and crew can all use to "stay on the same page." This is where the story structure and dialogue are mapped out, before the wild adventure of shooting the movie.
Take a look at this document which explains the style of Screenplay writing. And while you are at it take a look at this archive that is filled with movie and T.V. scripts!
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