I called and talked to them last week. You get a drivers license ($20, I think) and there are certain nights that leagues run (I think Tuesday for novice and Thursday for expert or whatever they call it). I don't know when they start the leagues, but once I find out more, I'll post up. I do know they run Enduro races which are the Endurance races. Basically it is a one hour race and it is a team race. One car, 2 or 4 drivers, you pit to fuel and change drivers and the team with the most laps at the end of the hour wins. Not sure if this is what is done in the leagues too, but sounds fun. Also, there are two courses, one indoor and one outdoor. On Saturday (I believe) they open the doors and combine the two tracks into one big track.
That's about all I know for now. But I should be going soon. I'll post up any new info I get.