here are some links to get you started in this crazy world of autocrossing.

home of the SCCA. You can find a region close to you here.
http://www.scca.org

SCCA Forums......
http://www.sccaforums.com/cgi-bin/ultimatebb.cgi

The Solo II novice handbook. Want to know what to expect, read this.
http://www.tirerack.com/features/solo2/handbook.htm

Want to know what class you'll be in, and who your opponents will be, check out the classifications.
http://www.moutons.org/sccasolo/index.html

http://www.autocross.us/links.html
http://www.autocross.us/clubs.html