Can't get started?

One or more of these might work:

• Write a loose narrative of the entire story. This is to prove the idea and give you a feel for the entire project. Loose means fully expect it to change as you write dialog.
• Start thinking about the end, then what comes just before the end, and so on back to the beginning. Guaranteed to frazzle your brain.
• Write a paragraph about what the main character wants. Then write another, and another. Introduce another character who interferes (knowingly or unknowingly) with the main character's drive to get what he wants.
• Forget about acts, episodes, plot, and parts (beginnings-middles-ends). Work on story, characters, and scenes. Test the story, create the main characters, write the scenes in any order (eliminates writer's block). When the first draft is close to completion, work on the scenes serially to close gaps, remove unwanted repetition, fix production unfriendly (or impossible) business, fix awkward transitions, fix voice irregularities, and get the whole tone right.