the best tools to use to work on aluminum?

Sorry if this is in the wrong forum, but wasnt sure where to put it, but this is my first time to try to fabricate parts for my truck, and i was wondering what tools are best to use on aluminum to counter sink the screws and to drill slots in so you can adjust the plate either this way or that? thanks for anyhelp as you can guess i'm sorta clueless to this and have no idea where to even start.