When you first start out, it may be helpful to start by building a relationship with your horse before attempting to teach him new behaviors. The best way to start training your OTTB horse is to teach him how to lunge correctly. Begin by training your horse to respond to your voice and commands. After a week or two, you can begin to work on the basics of getting your horse to move in a forward motion, stop, turn, and change direction. Once your horse is comfortable with these movements, you can begin working on different gaits and using them to improve your horse's ability to change direction. Keep it simple and use basic commands such as Walk, Trot, Canter, Steady and Whoa. This will help your horse to get used to his new leg aids and helping him understand them.