Thanks for all the advice. It went a lot better than I could have expected. I tried to stay calm and focus on the basics and my breathing. But when you get out there everything changes.
I won my first one, lost the second, won the third, and lost the fourth to be eliminated. My first loss was to an arm bar. I was being careless and basically gave it up. My second loss almost went the time limit, and I was contemplating not tapping even though he had a choke in really tight. I tapped when I couldn't breathe because everything went black. After the match I realized I would have had to hold out about another two minutes, when I thought the time was up in just a few more seconds.
I won on a triangle and an arm bar. That's a good feeling.
Overall it was a great experience and I'm ready for some more.
Thanks again.