I talked to the SCCA club racing group.
I'll need the firesuits and helmet (~$450 for the gear, already have helmet).
The car does need to be race prepped. So if I wanted to run Showroom Stock, I'll need the safety equipment installed on my car. Things like full roll cage (~$900), 4-point harness, race tires (not street), and whatever items are in the 2001 Club Racing Rulebook.
Oh well, maybe some other time. I could spend a couple of grand on places like Bob Bondrants School (Arizona), or Go For It services (Lousiville). Unfortunately, I have to pay for rent, food, car stuff, etc. So it will be a while before I go.