Good for you for thinking ahead!
My baby was 8 lb, 8 oz, so we used the newborn diapers for only about two weeks before we outgrew them. Our favorite diaper so far is Pampers Swaddlers. We’re working our way through a box of Luvs. They aren’t terrible but we prefer the Pampers. We’ve tried wipes from BJ’s and ShopRite but our favorite is Huggies Natural Care, which we got at BJ’s and found that to be the best price. I like them because they’re a bit less “chemical” than the other wipes, plus they’re the thickest. They also come with a handy dispenser box which is the best we’ve seen.
However, you might want to hit your supermarket for smaller boxes of NB/size 1 diapers so that you can test them all out and see which ones you prefer. There’s nothing worse than buying a huge supply of diapers only to discover that you don’t like them.
I was convinced I was going to use cloth diapers but I’ll be honest, at this point, I’m sold on disposables, at least for a few months. I know it’s awful for the environment, but newborn poop is pretty nasty and it’s nice to just throw it away and forget about it.
Regarding other necessities, if you have anyone preparing meals for you, or if you’re preparing any for yourself, we found that to be extremely handy. If you are a Groupon-er, see if they have any coupons to local restaurants that you can use. Also, consider other things that you won’t want to run out at the last minute for: baby wash, mommy and daddy wash, easy snacks (protein bars, etc), laundry detergent (we bought free and clear and wash our laundry with our daughter’s laundry), burp clothes (if you’re handy, making your own is easy and cheaper than buying). Also, assuming your plan is to deliver vaginally, make sure you have a few weeks’ supply of your favorite sanitary napkin at home. They say you may bleed for up to 6 weeks, but I’m at 5.5 weeks and didn’t need a full-size pad after, say, 2 weeks.
If I think of anything more, I’ll let you know.
Good luck and best wishes!