wheel spacer

Hi, I would like to know how should I space my wheel so it’s fine but not too much And if I put a 2,5" lift kit, how many inch my wheelcan get bigger without touching my body ? Thxxx :)

After 1 month of elbow grease here is a quick before and after of my 4.2, still more to do cosmetically ie window tint and paint my door mouldings black, I have a set of those universal wheel arches (cheapy ebay specials) I'm in two minds whether or not to fit. I have 35 ml wheel spacers now and...