Not a bad start.
A couple of "rules" (more a set of guidelines) to consider:
Each page of a screenplay is roughly 1 minute of screentime; try not to hit more than two discrete scenes (w/dialog) per page.
Keep your final product at ~90 pages, if you're looking for mass-market big screen distribution.
Introduce your characters. (For instance:
Quote:
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CLOSEUP of a clean-shaven man, CAPT MYERS, with his hat on, standing up with minor decorations displayed.
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Minimize narration: Voice overs (VOs) are good for documentaries, but if you want an action/adventure flick, VOs will lose the audience quick. Let the characters and the director tell the story.
Hope this helps. I'm married to a screenwriter and work occasionally with a writer/producer.