You don't say what your intension are, so I'll assume pleasure/trail horse. Walk,Walk and more walk. It may seem to be very boring in the beginning but will be a great base for anything else. You can never walk enough, start on the flat then gradually increase time, distance and terrain[hill work up/down] You can still train @ walk, circles,serpentines,walk/halt transitions,rein backs,head set the possibilities are endless. I would stay away from round pens or lungeing as they keep him on a circle which puts torque on joints, older horses[well all horses really] tend to do better soundness wise if ridden more straight. Then they only have the concussion without the added stress of the torque. I love the old ones.Enjoy.