Welcome to ER cgates30. Your setup would be very similar to mine being a two belt system. I suggest you start your own thread and post up some pics and we can work out any kinks and questions you have.
A golf cart motor may be good, but from my ebaying, they usually don't have an end on one side since they mount up to a transmission or differential. This means you'd have to make your own which is really not easy unless you have access to metalworking machinery.
You're right, a controller would be nice but is totally unnecessary once you size your pulleys right.