Since at the beginning he does not know anything, keep your lessons very simple. However, always watch your horse, he will do things right without knowing it and it is your job to make sure he knows it is right. Reward often, stop and give him a break, a pat on the neck, talk to him, let him know he has done well. While schooling your horse it is important to think like a horse, because you will never get him to think like a human. There is no confusion.
Grey areas make confusion.
Horses cannot handle confusion - it causes resistance. If you are teaching your horse to lunge and all he does is stop and pull back, he may be confused. Instead of asking him to run around at the end of the line, bring him in closer to you and only ask him to take a few steps in the right direction, then reward him as if he had lunged like a pro. After a few times, he will get it right. Teaching a horse his leads is a time when some horses can get very confused .