I recently bought an 1985 z28 Camaro. To tell you the truth I'm just starting to get into the car scene and performance wise i don't know where to start. Any suggestions?

Headers is always a good place to start.

Intake and Exhaust. Simplest, and one of the most important places to start. Though i beleive the 1985's where still using carbs.

Tell us more about the car.Wich engine ?How much you want to spend?

Being a previous owner of an '85 Z/28, they came with TPI intake system. Starting with the exhaust system first will improve performance. Whether choosing an OE exhaust manifold system back or cat-back system, it depends on how much effort you are willing to put into the project.

Removing smog for headers might be an improvement. Regardless the route taken, headers or OE exhaust, #8 spark plug is a pain to change.