Moved to "Racing, Rally & Autocross"...
to the wonderful world of AutoCrossing!
I encourage you to read the extremely informative "stickies" we have at the top of this forum area.
Or, easier yet...
The Who's Who of Focus Autocrossers
A Novice Guide to Autocross
Allowable Mods by Class (Autocross)
Some quick suggestions off the top of my head for a "noob" to AutoCrossing:
1) Read the above threads.
Pay special attention to the "technical inspection" you'll go through before it's time to put the pedal to the metal.
2) Above all else, have FUN!!!
3) Don't get your expectations up in the clouds. (We all had to start somewhere)
This is an extremely technical sport.
Talk to folks that have done it a while.
You'll find more often than not, everyone's willing to chat with you and pass on many years of learned driving experience.
4) Don't worry about "mods" (suspension/engine/appearance)...
Run what ya brung, till you can't get anymore out of it.
At that time, you'll know instinctively what you need to change.
I will say though, good tires are a must.
tires per say, but you don't want to head out on bald all-season tires with the cords showing.