Be true to yourself in your writing. Write a fictitious account of what really happened. Dramatic truth supercedes real truth. Do one thing everyday do affirm your commitment to writing. Keep setting new goals.
Good screenwriters observe the interplay between people.
Discovering your theme after you've finished gives you more insight for the next important step, which is the rewrite process. Your goal as a new screenwriter is to get your work read, as much as it is to get representation. Work with other writers and do coverage on each other's work. Don't use term paper style covers or folders. Color card stock is okay.