The snake is definitely stressed right now so I would recommend that you leave it alone for atleast a week so it can get used to it's new enclosure, give it plenty of hides. Also if you can post a pic that would help us give you better info on the husbandry that it would need. Did the vet tell you what kind of snake it is?
Also thank you for getting past you fears and helping an abandoned snake, very brave of you.