http://www.steamymirror.com/dsc240sx/link/linksinfo.htm
Scroll down and check out the racing section, lots of good auto-x info on a few of those links.
Don't expect to be competetive your first time out.
Have fun, that is the ONLY reason to do it.
I'd recommend running the same f/r tire pressure. Higher in the front = understeer. Higher in the rear = oversteer. So, whatever you want. Driving has more to do with it than anything though, don't worry about your car too much as long as it's in good cond. But, those articles will give more detail than I can.