What you do in the saddle begins on the ground. Try working with your horse going around cones from the ground with a lead rope. Then take two cones spaced about 20 meters apart and walk him in a figure eight around them. When he can do this at a walk and trot then he will be ready to do it at a cantor. Remember to face your belly button away from him as you ask him to go around the cones otherwise you will be blocking him and he won’t come towards you. I recommend The Parelli 7 savys dvds to begin ground work with him.