Congrats on your first CA!
This document on the FIRST website:
http://www.usfirst.org/uploadedFiles...20Criteria.pdf
will give you everything you need to know about Chairman's. If you scroll to Submission Content with the bullets on page 2, each sentence there is something you're going to want to talk about in your submission. I think there's 6 of them.
Best of luck and feel free to contact me if you have any questions, I've been doing submissions for 7 years now and have a pretty good grasp on most of it!
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This season, I was a part of a great team, with great kids who were really inspired, and who inspired me back. That's my brag, what's yours?