Video Video Video! Get that shit on film. You have no idea the things that can be corrected when you and your coach sit down and watch your matches/fights. You will learn tons!
Be ready for intensity that is considerably higher than at your regular gym that you rolls with friends at. In competition, people are going to try and take your arms off. Be prepared and be tight with everything you do. If you are going to play the rubber guard game, have a clear train of thought as to how to get from step A to step Z. Make your opponenet stop your flow, not the other way around. Good luck to you, i hope you do well. They only get more exciting and addictice from here.
(sorry about spelling)
RW