There is no defined timeline of events. Keep pairing them up until you see an ovulation. Once you see the ovy then you can start working the timeline which even then varies a bit.

The link Deborah gave you is very useful as is this forum. Keep researching and learning.

This is not like breeding dogs one tie up and puppies in 2 months. There are lots of variables in breeding BPs so a true to the day timeline is not available.