I'm in a similar boat, starting out with mods. My first was a Roto-Fab intake. Next, was Solo axle-backs to quickly give it sound, stock was annoyingly quiet. The best, quick thing I did was to get a Cortex tuner. For around $200 for a used one, it's well worth it. And assuming you get a cam, headers, etc (which will require more tuning than a Cortex can do), you can get your money back out of the Cortex when you're done with it.
I'm starting to compile my list and pick parts for DOD-delete and cam. BTR is probably the direction I'll go.
2009 PBM GT
Under the Knife Again
Wiseco Pistons, K1 Rods, Johnson Lifters, BLP Keep Hatin' PDS Cam, Roto-Fab, BLP Ported Intake and Throttle Body, Kooks 1-7/8 long tubes, XForce Varex Catback, ZL1 Converter, Camaro Trans Pan/Filter, GXP Brembos
Breyton GTS-AV Wheels, 6k HIDs, Holden Steering Wheel and Paddle Shifters, Eibach Springs, 35% Tint
Tuned by Day Tuning