From the top of the head: all the stuff you will have to buy, you will, but speaking of diapers, if japanese Merries are sold where you live, that’s the shit. Everything else leaks, leaves rash, looks uncomfortable, etc, and you don’t want to buy a pack of everything to try out.
And speaking of things you can’t buy, one good setup thing. If your wife is going to breastfeed, she would have to get the baby, and then put it back at night. We just removed one side of the baby bed, i fixed it at even height with our bed, and put it right to the side of ours so then my wife could just drag the baby closer and feed without completely waking up. And when done, the kid is already almost where it has to be. This improved our life quality with both kids.