[Edited] The winning plan is to force the king into either of the corners which have the same colour as your bishop.
This is done in a few steps.
- Force the king to one side of the board so he is stuck on either the a/h file or 1st/8th rank
- Use the W manoeuvre to force the king to the corner of your bishop, then use the motif of knight check on (e.g. Na3+ to hit b1) then mate with your king on b3, knight covering b1 and Bishop mates on the long diagonal (e.g. Bg7#).
I have put a detailed review of each step of the ending on my website.
Moderators - please let me know if the content is not appropriate and happy to take down and thanks for the feedback.