If you're prepping a track car, the first thing you need to do is figure out what you NEED to do. For example, figure out what class, read the rule books, get the car mechanically safe and sound under the rule book, etc.. If you're completely new to track stuff, then your first thing after getting the car safe mechanically is to just go out and get seat time. Do as many HPDE's as possible and work your way up. Starting with as most of a stock car as possible is always best.
Regardless, first thing I'd do in your situation is get rid of those junk Tanabe coilovers and get better shocks.