Running a N/A 350Z at the ring as a beginner I would start with the following.
Decent tyres: R888 or similar, providing it is not peeing it down.
Eibach sway bars front and rear (anti roll bars)
RBF 600/660 brake fluid and a set of braided lines
Full geometry check and adjust:
Some CAT driver training.
R888s, Eibach sways, 600/660 fluids and lines all in stock and good to go same/next day.
Drop me a PM if I can help you further:
Alex