Typical BBQ contests (KCBS, FL BBQ, and I assume others) have the following 4 categories:
The typical KCBS contest will have you turning in an entry every 30 minutes Chicken at Noon, Ribs at 12:30, Butt at 1:00 and Brisket at 1:30. FL BBQ is typically every hour.
Some recommend attending a judging class to get an understanding of what the judges are looking for during a competition. If I were you, I would join the FL BBQ Association (google will take you there) and sign up for a judges class. There is one schedule in Perry FL on 12/13. I'm hoping for a NE Florida judges class and hope there will be one soon.
Hope that helps!