Also when you are leading if you have a crop to reinforce your commands that really helps. You have to understand that if he was left for his first year and not peopled then he doesn't know to respect you. You must show him. Is he out with other horses? If not I would definitely put other older horses out with him. They can teach lessons in minutes that would take you months.
The only other thing I could suggest is finding a trainer that will come and do "lessons" with both of you. Get them to help you out in a lesson situation...this way you aren't paying the big money to get him trained but you still get the help of the trainer.
Good luck and hope everything works out for you both.