I listened to a Webinar last night given by "Story Merchant" Ken Atchity. I've summarized his 8 steps to sell your story to Hollywood:
1. Write a "Log-Line" which is a one or two-sentence pitch to capture the essence of your story. Ex.: "He was left behind. On Mars." for the movie The Martian with Matt Damon. This will be used in advertising to attact an audience.
2. Write up a one-page pitch that includes a description of a strong protagonist and his mission as well as your antagonist. Hollywood likes a story that is American-related, has 3 acts that are clearly defined to form a story arc, and has a strong theme.
3. Prepare a Treatment which is a short, written pitch that includes an emotional reaction to the story. Think of it as a letter to a friend describing your most exciting adventure -- written in present tense. Write only "obligatory" action, not any side activity.
4. Register your Treatment with Writers Guild of America at www.wgaregistry.org/registration. (Costs about $35)