Cause you're due in late summer (hot!!), I wouldn't get thick wraps, muslin/cotton ones only. And probably only about 4-5. And yep, the bigger the better! How warm is it at night there? If its warm, I wouldn't get too many warm onsies either, lightweight cotton or bonds suits. And bonds is a small fit so get sizes one size up from what you actually want. Unless you think bubs will be fairly small, I would start with 000, maybe a few 0000. My DS was in 0000 for about 2wks if that, then 000 for about 6wks, he's already pretty well out of 000 and into 00 , we could have sotten wawy with no 000. Generally while your at home you will most probably have bubs in a nappy and singlet/shirt. Unless you have air conditioning, then probably have some short sleeved suits for him.They usually need socks unless its fairly hot, so a fair few pairs of lightweight socks. Hmmm....some rags for spew rags, maybe use terry towelling nappies. Some towels and washers for bubs.
As he gets bigger have some 00 size jumpsuits for those days that are unexectedly cold, and maybe a light jumper/longsleeved shirts in 00. They grow so quickly, as I said my DS is in 00 and he's only 8 1/2wks old! DD wasn't as fast growing but was in 00 by about 10 or 12 wks, and only fitted in 0000 for about 3-4wks.
It might be a good idea to get a rocker/swing thingo so you have somewhere to sit bubs and something you can drag around the house while you do house work or shower etc....
Thats all I can think of!! HTH