I've just purchased my first car last week, a red NA6


So, I'm planning to sell them off and get myself a set of 15\" Black Racing Pro N1's in grey for that fat JDM look

I'm a total beginner and so was wondering if I can get some advice on:
1. Where can I buy them from? Looked at many places, no luck so far....
2. What wheel width, offset, etc should I be looking at?
3. What tyre width? 195 or 205?
4. Are there aftermarket alloys that are just not meant to be put onto a RWD car due to different offsets from FWD? What are ideal offsets for a RWD?
5. What tyre height/thickness should I be looking at?
Thanks in advance for your response!