My little girl was 8lb11oz and in the size 0 nappies for about 2 weeks then in size 1 for about 3 months. I would buy more of the larger size and just a few of the newborn. When it comes to wipes just buy as many as you can afford and store you'll be using them for at least 2 years and you get through a lot.
If they have Muslins on sale but a couple of muti packs they're great for warm weather blankets, bibs, burp cloths and general wipe up of snot, sick and spit.