Start here for offset concerns (spacers).
When you go to install the rims, put your OEM lugs through the OEM rim holes and see how much sticks out. Then take an aftermarket set of lugs and put them through the back of the AM rims and trim till you are roughly the same length coming out the back of the AM rim as the OEM ones have in the OEM rims. If you are not in such a hurry, go measure everything the same way and order appropriate length lugs instead of cutting....