Mike from the SubStream's "Film Lab" has some tips regarding screenwriting, specifically... documentary scripts.
Learn how to write a script for a documentary film. If you're making a documentary, don't think you won't need a scriptwriter to make a script. The screenplay is a necessity for docs, you just don't know it yet!
It sounds counter-intuitive, but writing a script for your upcoming documentary might just be the smartest thing you can do for yourself and your project. Mike lets you know why, and how.