Your job as a screenwriter is to get a movie going in the mind of the reader, and not distract from it. The best and easiest way to do this is by starting with proper screenwriting software—some of it free. This will put your script in the right screenplay font, using the proper screenplay format. Consider general screenwriting pointers and specific tips and suggestions on writing good screenplay action narratives and winning screenplay dialogue. Of course, you want to think through the best concept for your movie, consider how to draw the most compelling characters, as well as construct the best dramatic story. Well-written action narratives and engaging dialogue will ultimately sell your movie to Hollywood, but you may want to look over tips on marketing your screenplay just in case.
Or you could just push the "Help!" bubble below to get help with your screenplay.