Start here. It doesn't matter if you prep bodybuilders or coach youth sports, HS sports or Elite athletes. The same principals should apply (or variations of it). If the athlete or bodybuilder doesn't make a connection to the coach or buy into the program, you're not doing your job as a "coach'.
There are some very good coaches that I've seen in bodybuilding that can almost fit this description, Neil Hill comes to mind. Charles Glass (because I see him everyday work with his clients).
I've been a coach for 15 years. I apply the same principals with my bodybuilding clients as I do my HS and college players (Yes, I'm coaching at a college as well). There are quite a few former D1 athletes on here that have had great coaches. They should know what I'm talking about.