Please refer to the SAFC tuning guide in the FAQ thread stickied at the top of this forum to get started tuning your car. You're going to need a datalogger- a cable, a palm or laptop, and the software. I'd keep the boost down as low as you can go until you've got it tuned properly.

*edit* one of the links I was talking about
http://users.wpi.edu/~ktarry/dsmtech/tuning.html