Before you try breeding you really need to read every sticky on this site and get all the info you can. If you can't properly care for a BP you are not ready to breed for a while.

You must have constant temperatures in the low 80's on the cool side and low 90's on the warm side. If I remember correctly, the temperature drop at night is to signal the BP that it's fall/breeding season. You shouldn't be trying that unless you are fully ready to breed, you may get it wrong and run the risk of the snake getting sick.

Please don't breed any snakes until you do alot more research and know all of this by heart. Alot can go wrong, even for experienced people, but at least they have experience on how to handle those problems.