Wheel size and tyre fitment

[chasw7]

Hello, Ive got the chance of buying some BBS RX 17" wheels. I havnt seem them in the flesh yet, and the person selling them doesnt know how wide they are. They can tell me the numbers stamped on the side of the wheel. I need to know as much as I can about the wheel spec. width/offset etc...Ive found a couple of sites on the net explaining wheel fitment, but nuthn that makes clear sense.
Can anyone help?? What is the offset on a mk4 golf??

The wheel says: ET35 RX201 8Jx17H2

Can anyone reccomend me a tire and size? I am willing to pay for perfrmance tires.

I am familiar with VW Audi fans stretching undersized tyres across rims. I want to learn more about this but I do want to stay safe and not sacrifice any performance for stupid styling efforts. Anyone know about this??

Cheers,
Chas W

[chasw7]

9inches wide....too big 4 me.