Congrats on the car! Its a lot of fun. I'm 22, so not too far ahead of you in the age department.
I agree with the other posters here who said start with the suspension. I would say go suspension, motor mount, brakes, and engine monitoring electronics. Then, after that, start adding in power slowly and strengthening the internals if you still think you need to mod power. You can look at my sig and see what's going in my car right now...I would say following a similar approach is the safest way to mod the car if you absolutely want to.
Feel free to PM with any questions you have about particular items on my car compared to other similar items available, and enjoy the car! In all honesty, you don't need to do ANYTHING to it to have fun with this car, but there is a lot of potential if you do.