time attacks, road racing, etc, can be done thru
http://www.scca.org like repo man said.
I'm currently into autox:
http://www.solo2.com/ (that's the so cal one taht's close to you)
Next practice is October 14th. Next "championship" is October 15th. Practices open about 2 weeks ahead of time and on first-come-first-serve via usps mail, around so cal, they fill up w/in the first 2 days typically. Championships are more noob friendly, though you get less runs - but you get novice walks, instructors available, etc.
If drift days are your thing, check out the drift subforum (I don't currently participate in those, so I don't know the sites, but there are plenty).
Also, you can typically do forum searches/google searches if you want to run full race track (i.e. buttonwillow/willow springs). I know the srt4 boys run it montly.
As for a tools checklist, should be available either scca.org or solo2.com.