Just want to say I know how frustrating it is to be new at keeping BPs, also that "too many cooks spoil the broth" so I'll let you rely on Deborah...

For a "baby" (hatchling) BP, mouse pinkies are way too small (they can get stuck on their teeth as they try to eat them) & even a rat pink would have been too small.
Don't worry, you'll get all this...BPs are NOT easy beginner snakes, but so many are encouraged to start with them because they're docile, stay a nice size & are pretty.
They don't always tell you they need so much monitoring as to temps. & humidity, with more cage warmth than many other choices, and that while they usually eat
reliably when young, they frustrate many keepers as adults when they fast unpredictably (not always in winter) & can be very fussy eaters. Welcome to "the club".