Check out MyAutoEvents.com and look for events in your area. It may be too late in the season to find a local club doing a "novice school," but you don't need to attend one before autocrossing.

There is a dedicated autocross school, EVOlution Performance Driving School, that can help you improve your skills. I did one last month and learned a lot. But, I've been doing this for a few years and know a little about how the events work and such. You'll get more out of it if you've autocrossed a little bit first, IMHO.

My advice - find an event near you, sign up, show up early, and ask lots of questions. Autocrossers are, as a group, pretty friendly and willing to help newbies out. And have fun - that's what it's all about in the end, anyway.