Nobody from F1 is scouting for drivers, so listen to your instructor, pay attention in class and more importantly, have fun.
If you run with one of the establish clubs like PCA or BMW CCA, they will require a tech inspection by an established shop. The shop will look the car over and make sure it’s up to snuff for the track ie brakes, brake fluid, tire tread depth, suspension, etc.
I like two day events, the first day you’re learning the track and the second day, you’re going a little bit faster and with more confidence. I like it even better, when they have an open track on Friday. Lots of seat time.
Lots of guys have dedicated track cars, but most are street legal. Mine is street legal (for SC), but I’ve reworked the suspension, headers/exhaust, stripped interior, lightened the car, harness, Hans, race seat, roll bar, etc. Since I don’t drive it very much on the street, I’m OK with it. For a daily driver, it wouldn’t be fun.
I would bleed the brakes with some decent brake fluid and verify your brake pads are at least 50% if not more.
I use Bosch brake fluid.
https://a.co/d/bJ0XAwH
Edit: Don’t forget to use your mirrors. If somebody catches up to you, they are faster. Let them by with a definitive hand signal. I hate wimpy hand signals. There’s nothing worse than catching up to somebody and they don’t give a signal to pass. And when they do, they don’t lift and it’s a drag race. Don’t be that guy!