Help with fitment
 

With all I read so far I'm still stuck bc I seen diff sizes an offsets. An I know nothing bout this. 2010 blk nismo looking for a perfect offset an size rim. 19 or 20" What do ya suggest would look the best

19x9.5 +22 offset front
19x10.5 +12 offset rear

These are the most popular. You could go 20, width's and offsets still apply, but the tire sidewalls get very slim.

Got Enkei GTC-01

19 * 8.5 with 42 mm (front)
19 * 10 with 22mm (rear)

Was thinkin of going 20's. 20x9.5 front an 20x12 rear. Just not sure what offsets will work an look best

Try this wheel offset calculator. For a 12" wide rear wheel you'll need about a 30 offset IMO (if you're running lots of negative camber you could go a little lower). Would be a tight fit with that wide of a wheel but I'm pretty sure a few here have done it.