Well, you seem to be in need of a trainer.
Try to exercise it as often as possible. At his age though, I'd give him longer warm up and cool down periods. I'd also only ride once a day.
It's really up to you about what kind of training to do. Just take a look at where you want to go with it. Do you want to show or trail ride? Ask yourself questions like that, then take it from there. For example, if you want to do a lot of showing, Parelli and such may not be enough for you. You may need a more strict and focused schedule. But if you want to trail ride and relax, you may find the natural stuff to be easier on the horse, enjoyable for both of you, challenging enough to make it interesting, and sufficient for what you do.