So really it depends on the stage of development of your tree.  If it is a young tree, I would just let it grow and wire the branches now to give them some movement.  The pruning back to two buds is for trees that have a primary branch structure already, and you are just ramifying the branch.  If you are pretty new to bonsai I highly recommend finding a club nearby and taking workshops.  That is really the best way to learn to make trees you will be happy with.  Also, if you have questions about a specific tree, i really suggest posting a picture or two of it so we can see what stage of development it is at.  Good luck to ya.

Alex