I have taken the SCCA Level 1 school more than once. DLB Racing is a sign-up service, and does not run events. There are SCCA and BMW club schools coming up in April, and sign up for both is through DLB Racing.
The SCCA Level 1 is a good introduction to the autocross discipline. It consists of orientation lectures about the (minimal) rules of the game and coursework, then drills illustrating some basic techniques (driving line and throttle steering mostly), and then runs on a mock course, with instructors riding along with you, and then driving your car so you can see how to do it. The local SCCA leadership's personalities can be a tad . . . ahem . . . forceful for some tastes, but the program is very good and will prepare you well for getting out there and campaigning.
Autocross schools in general are good because they give you extended seat time.
In "real" competition, you get an aggregate elapsed time of less than five minutes on a given course, and its real hard to figure out what's going on, much less how to improve.
So, I go to every school I can find. Caveat -- I still suck, so neither the SCCA schools, nor any of the extensive training and instruction I have received elsewhere, has made up for a deficit in raw talent, but I am proof you can still have a lot of fun even running behind the fast guys.
As to classing your car, we need to know more about it to help you figure out what class you'd fall into. What mods have been done to it? Be thorough -- Suspension, brakes, subframe, engine/drivetrain, etc.?
