Keep in mind that he was out for 3 months so who knows what he was eating, if at all. I would gather his first poop in the enclosure and take the poop and the snake to a vet to get a check up first thing. Even if your snake appears to be healthy it doesn't mean they are. Make sure that your snake has somewhere in the enclosure to hide completly, I would imagine that is what he needs right now considering that lack of contact he has had the last few months. The rest of the information on husbandry stated above is good information, use it. Other than that good luck with your new BP and feel free to ask ant question as this is a very good forum with lots of individuals committed to getting good information out. Welcome to the forum.