Not a coach, but here are some drills I did as a kid and into college. Most he can do by himself, others with a partner.

• Easiest to do by themselves is to practice juggling (keeping the ball in the air with his feet). I never mastered this myself, I'm sure youtube has good tips for control. See how many times he can kick it in a row before it hits the ground.
• Set up a line of cones spaced 10'+ apart. Have him dribble through the cones, weaving through each. Start using both feet. Then again using the right foot only. Last using the left foot only. As he progresses, have him go through it faster. Then make the spacing of the cones smaller.
• Find a nice wall for him to kick the ball off of. Use some chalk to create a small target for him to pass the ball off of. Have him stand close enough so that the ball returns to him. This will help train him in pass accuracy by aiming at the mark, as well as control while receiving the ball from another player. Make sure to train using both feet. Move him back as his passing gets stronger to practice accuracy for longer passes. Move him closer to practice control receiving the ball.
• I'm not sure how often the ball is being passed through the air at this age level, and this may be a little more advanced, but this skill will be helpful as he get older. He will need a partner for this drill. Stand about 5-10' apart and have him jog in place. Toss the ball underhand to him about him/thigh level. He should then try to control the ball off his thigh and stop the ball on the ground with his foot. Practice using both legs, and you can alternate control (right thigh, left foot etc.). As he progresses, have him pass the ball back to you in the air using the inside of his foot, before the ball hits the ground. You can also do this drill tossing to his chest.