Help picking wheels ZJ.
 

First time here, usually just read other forums but decided to post.

I have a 93 Grand Cherokee Limited 4.0 (ZJ) that's in the process of getting bigger.
I just purchased 32x11.50 15's MT/R with Kevlar tires that are going to be put on this Tuesday.
Currently have a 4 inch lift and I'm worried about rubbing (but i'll look into that later)

Well, I wanted to possibly get some new wheels to go along with new tires, I'm just not sure (or I don't understand) how to pick the size.

I'm looking for something to give it a little wider stance, and I see the Crager soft 8's on Summit Racing that are fairly cheap.
Could someone help me pick the right size wheels for a better stance and get my ZJ to look a little better?
I have a few problems with my ZJ that I'd like some opinions on but I guess I'd start a new thread individually.

I would also like to add that I'm not too sure about this "back spacing" thing, feel free to explain this in the easiest way.
Thank you.

Most commonly recommended would be a 15x8 or something similar in the soft 8 with whatever backspacing you chose, the easiest way i can explain backspacing, is that it is how much of the rim is behind the center line(inward to car) so the lower the number, the more wheel is sticking out(outside from car)