Your spot on in all respects information is hard to come by in all areas of karting. Tracks list the classes they run but not the participation levels so there isn’t any way to know if it’s an active class. KZ engine manufacturers love selling a $5500 engine package but none of them offer a service manual I could get for a $175 chain saw It’s insane. There is no beginners guide I know of that’s complete. The standard advice for the beginner is “go to your local track” That’s OK if you have a local track and your lucky enough to randomly pick the right people to talk to and not the knuckle heads.