one of your larger tasks is going to be to keep him motivated. add variety, make it fun, compete a little with him with fair chances, get some music he likes in there, look for ways to compliment him, find his progress and show it to him regularly, let him help with his training plans, make a progress chart and hang it in plain view for everyone to see. when your aout in public with him and talking to people work it into conversations how cool it it your brother is training. all of these things will make him feal good and motivate him. what ever you do dont ever let him look at a mistake or lack of progress as a bad thing. its just a part of learning.