The search function will yield a wealth of information.
As far as the gears, I assume you have not done this before. Pick up a set of FRPP gears...worth the extra couple dollars then find a reputable shop and have them perform the install. You can pick up a basic install kit or have the shop do it. Either way, it'll probably run about the same cost. You will also need a tuner to program for the gear swap. The car will not run properly otherwise. You can get either a Diablo Sport Predator or a SCT Xcal2; they both run $400.
Hope that helps...
LB