The following videos will help you prepare for your movie pitch.
This video features a film school instructor explaining strategies for the pitch. In particular, he focuses on defining your project early; make sure your audience understands the basics about the film in the opening minute. He also mentions the importance of the greeting, body language, and hand gestures.
This video features a number of young students pitching their ideas. Assessing their work might give you some ideas about how to approach your own pitch.