wheels for mk4 polo

i want a set of dish wheels
i like the ATS classics but im new to doing things to cars but im learning
could anyone help on some 13" wheels

do i need to roll the arches on the rear?

how low can i go?

what type of tyres are good?

do i need to use spacers to clear the calipers?

or what other types of 13" inch wheels are good?


thanks alot just hard to choose when there so many types

cheers
stuart