Learning the rules of the road is a big part of it. All of the same rules apply to riding as they do for driving...I think most of us assume that you are a driver already and getting a bike license as secondary transport. For rules of the road training, I would almost recommend going for driver draining at AMA, or something like that...most of the beginner rider training is based on riding skills, not learning the road rules. The testers watch to make sure you are using your signals, stopping at the line before making the turn, slowing in school/play ground zones, obeying the speed limit and other basic rules of the road...
Extra training is never a bad thing...they will re-enforce defensive driving...
Good Luck!!