Hey Guys...Had my 2001 Gt for a little over 6 months now, and i want to start putting some aftermarket parts in to give it more HP and Power...what are some simple things i can do first and then some other things that will help....thanks for the help.

I would go with CAI (cold air intake). I did have that one time on our car but I removed it as I'm concerned about the water going in to my intake.

However, CAI is very good summer and not raining.

You can use an aluminum underdrive pulley if there is one available for your vehicle.
If you got a heavy metal wheels, try replacing it with an alloy wheel to make it lighter.

CSC or Turbo....

big money but lots of Horsepower gained

Turbo is not currently avalible but will be soon.

Turbo when will be available? That is a great option.