There is a post at the top of this forum about places to start... But since you are new...
Optimised Throttle body
Cold air intake (or short ram)
www.ctamotorsports.comHeader
www.zxtunder.comcustom exhaust setup... a lot of people like to try the SVT exhaust (id like to, but cant find one in my area).
Esslinger underdrive pulley
Adjustible cam pulleys
Ford racing wires
Accell Coil
Forced Induction:
Jackson Supercharger (talk to LoCoZ S/c)
These are just a few ideas