Be sure to weight out mods for money vs. gain. I just did a magnaflow exhaust and Mazdaspeed intake. Probably all I will do, but it was over 500 bucks for both with moderate gains. You can easily but several thousand into a car for little gain.
Dont worry my friend...all of as were newbies at one point. A very helpful thing to do is brouse this forum for as many things that come to your mind. Almost everybody here can tell you how this forums can be veru helpful for understanding diffrent concepts and mods. Also a very important thing already said is $$$ and how much are you willing to spend...For further info on products and pricing check out cp-e.com and therpmstore.com