there's a FAQ somewhere in the welcome section and also a good write up on first mods. it has just about everything you need to know in them.
an access port new will run about 695 i believe. check nasioc classifieds you can pick one up used for cheaper than that. just be sure to get the correct AP for your car year.
start with a full turbo back exhaust (downpipe all the way to the muffler) then go stage 2 with the AP. then do stuff like steel brake lines, sloted rotors and better pads. then go to work with the suspension. springs and front and rear sway bars and endlinks would be a good place to start.
you really can't not spend a lot of money once you start.