-- WRITE FAST!  You want that first draft completed in less than 14 days. Sound impossible?  It's not.  Write quickly, trusting your first instincts and you will reap the rewards of having a more original, creative, first draft screenplay. 

-- Don't overthink your idea, and don't worry about story structure yet. As long as you have a major problem that needs to be solved, you will be able to write a first draft.

-- Know who your hero/ine is and what he/she wants and fears most. (This will allow you to mess with his/her life.)

-- Know who your baddie is and what he/she wants and fears most. 

-- Make sure your hero/ine and baddie want the same thing, then in the end make sure your hero/ine wins.

-- Create some kind of plot twist for your hero/ine every 10 pages, and try to make each twist bigger than the last one. 

-- Give all of your supporting characters unique personalities, and make sure they serve the needs of your hero/ine and baddie. 

-- Have a lot of fun when you write! Don't censor yourself.  Be rude, crude, funny, perverted, violent, creepy, angry, romantic, jealous or overly sensitive, if that's how you're feeling at the time your quill is moving. 

-- End your screenplay with your most emotional and exciting scene possible, bringing closure to your hero/ine's problem. 

-- Your screenplay should be no less than 103 pages and no more than 120 pages, with very few exceptions.  And lastly...

-- Don't procrasterbate!  Write now!