A lot of the raising of baby will surprisingly come naturally to you, so I will offer advice on what to pack in your hospital bag.
At least 1 preemie outfit (sometimes they swim in the nb)
baby nail clippers
your change of clothes/pajamas. socks. (keep in mind you do not go back to pre-pregnancy weight right away. pack maternity pants from when you were roughly 5 months pregnant)
change for the vending machine
and buy some big *bleep* pads (Poise) to have on hand when you get home. you'll be needing them
And since it's your first-definitely sleep when they sleep. When she is up all night crying, don't get frustrated and overwhelmed by it. Just think of it as extra moments your daughter is trying to sneak in to spend time with you.