T.
Put him in his crib and let him fall asleep on his own. He will cry! Do not pick him up! Wait 5 minutes and then go check on him. Then leave and wait 10 minutes before you check on him again. Gradually increase the time you wait before you check on him. He will cry!! Just stick with it. Try to distract yourself with something while he is screaming. Do housework or something. It will be hard but stick with it. It will be worth it in the end. Try playing some soft music in his room (but no tv - later he will want to stay up and watch it and then you have another habit to break). Good luck!