postpartum pad prep

I know that after this baby comes, there's going to be lots of blood. How many maxi pads do I need? I'm planning on starting to use a cup once my period starts again, and I never used pads before, do I don't want leftovers. How many maxi pads do I need? Do I need all super heavy overnights for ones for the whole 6 weeks? Or just the first week or so? I'm not fat, but I'm on the bed get side, so I'm thinking depends aren't a good idea either. Help me out please.