welcome to TR
STS is a great class for that Civic they ruled at Dixie National. On the East Coast John Morgan runs STS with his Saturn and puts down great times.
I run in SML with my 91 Civic Hatch, I've been running for 4 years now and the addiction has not stopped and neither has the upgrades to my car
I run with SCCA and BMW for most of my events. I have run with FAST and PCA and they are both great clubs as well.
Check out the Autox forum for events and locations. FL has a great community for autcross.
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if you can only race me in a straight line then whats the point 
...91 SMF SCCA
http://www.flickr.com/photos/8341770@N07/5601083432/http://www.flickr.com/photos/8341770@N07/5601083432/ by http://www.flickr.com/people/8341770@N07/, on Flickr
I see people out there spending money on the car to improve it … If you spend half that effort just working on your driving skills, making you and the car work together as a team, then you’ll go faster – period. To make the car go a second faster on the track takes a lot more energy and money than making yourself drive it one second faster.
– the late Tom Thrash SCCA Solo E Production