Welcome to BPNet and good for you for rescuing that poor snake and getting it to a vet right off the bat.

Just get it setup as per our caresheet (pls ask if you need any advice with that) and let it settle in quietly with no contact other than changing it's water and checking for feces/urates or applying any meds the vet has prescribed. Handling will come in time and that poor snake must be stressed very badly right now. Try to put his/her enclosure in a very quiet, low traffic part of your house. Wash well before and after handling the snake (especially if applying meds to that sore belly). When we did a burnt belly rescue we put him on the softest, whitest paper towels we could find until he was fully healed. Just give the snake lots of peace and quiet and in a week or so once his belly is much improved then perhaps offer a small meal to start him off slowly. Is he/she underweight or otherwise in ill health other than the belly issues?