Our twins were born at 29+6 because T2 had IUGR and were smaller than yours. They made it through 3 months in NICU and left around due date. T2 had a blood transfusion and some drugs to help her regulate her hunger but that was it. T1 just fed and grew. They started in heated incubators and don't wear clothes in those, so don't worry about that. We needed to provide nappies when they were big enough to have shop bought nappies, until then NICU provided super small ones.
Do not Google what could happen, the doctors and nurses will tell if any of it is a risk, and until that you don't need to know, you'll just worry yourself. The nurses will also tell you what you need to bring for your babies. I would advise having a battery pack for your phone, and a water bottle and some snacks, and perhaps a book to read whilst you're cuddling them (either one for you, or one to read to them) you'll spend a lot of time in there with them, and you won't be able to do very much in the beginning, but the nurses will tell you how to feed and change them.
You'll likely have a love hate relationship with the nurses, because they'll be looking after your babies but you won't be able to do anything like pick them up without asking for a while. That all changes when they move into open cots, and then they become much more like term babies and you'll be able to do more without asking first.
Good luck, I've been there and it's hard, but take one hour at a time, and you'll soon be taking them home xx