Aftermarket/DIY Questions 1999 Jetta Wolfsburgh 2.0L

I recently just received a decently kept Jetta from my brother. I have roughly $5,000 to put into this car. It needs a possible new throttle body but other than that, the car is in perfect STOCK shape. I want to put some aftermarket parts into it to make it a faster and stronger car. I know i should start with an exhaust system, cold air intake and the minor body work it needs, but after that , what are some recomendations? I am looking into a turbo system but i dont know if i cant DIY that. PLEASE HELP.