For best results you should wait & not handle him until he has eaten 3 times for you at normal intervals* without refusing food (unless he's in shed, then it's normal for snakes to refuse meals). This gives him time to settle in & feel safe in his new scary surroundings- if you handle too soon, he may refuse to eat from the stress, & that is best avoided. Put the snake's well-being first.
*Normal intervals for a young BP is to feed once a week. And never handle right after a meal, let them digest for a day or 2, so they don't regurgitate. So I know you're eager, like everyone is, to handle your new pet, but for best results try to just be content to watch him for a good 3+ weeks while he settles in, eats, & gets stronger & more confident- that will get you both off to a good start.It's worth it in the long run- you'll have many years to enjoy him- let him get stronger first. It's no fun when snakes refuse to eat, & stress can cause that.
BPs are normally nocturnal- coming out in the evening & nighttime hours, & sleeping during the day.