Staggered set up is a bit of a pain if you ask me. I have 18x8.5 +25 (25mm spacer so +0) up front and 18x10 +25 in the rear. I had to add the spacer up front to get it a more flush look, plus now that it's staggered I can't really rotate my tires (which are 225/40 and 255/35)
Here's my car from the side to show you how far it sits in the car
Do you have an idea about which wheels you had in mind, and maybe the offsets for them? If I could give one piece of advice, it's to maybe try and get 4 of the same sizes, easier to rotate tires.