Phenix, I think what a lot of guys have said here is great... there's a lot of good info shared in this thread from people who have been in the same position you're about to be in and there's really not a whole lot I can add because of it....
But here's two little bits of advice...
#1 - Remember... It's the same bike, the same rider, and the same pavement. The only thing that's changed is the environemnt... it's safer
#2 - Remember... You're not alone. As someone who's asked the question "Who's never ridden on the track before?" countless times in front of classrooms of beginner track riders over the last few years, at least 1/2 of the classroom will raise their hand.... Even AFTER we've come off the track from the follow-the-leader session, 1/2 of those people will raise their hands when asked the question a second time... I love doin that to em
If you keep those two things in mind your nerves should stay settled enough for you to absorb all the info you need and ride safely.
HAVE FUN!!!