Sleep. Because you won't get much soon.
Have a "schedule" ready - know who will be taking care of the baby and when. Right now since our LO gets up only once during the night, most nights, we switch every other night so that the other one can get some sleep.
Don't buy too much of anything - meaning don't buy a bunch of one diaper type or one wipe type or one bottle type or even one pacifier type because you never know what your baby is going to like. We stalked up on one bottle type - and our son didn't do well with it - so I had to figure out how I was going to sell it so I could get the bottle type that he wanted.
Also, we ended up having a preemie - BIG SURPRISE - and they get your baby use to one diaper, wipe and pacifier type - and they were all opposite of what I had so I ended up returning a lot of things.