Preparing a Pitch

Still not exactly sure how you will sell your proposal. The following link can get you in the right mindset and even guide you in the right direction on pitching your proposal. It elaborates on points one should hit and gives examples. The article simply starts by explaining the writer's responsibility and asking a question.
"Pitching a script is an art form, and although it can be stressful, it's something every writer has to perfect before approaching executives or agents. So what is pitching exactly?"
There is another related article found at the end of this one that can help set up your story. It deals with writing the first act of your screenplay.