D.H.
Hey L.,
I have coached little one's in soccer. I would take him to a soccer game, baseball game, and or karate lessons to check them out. Make sure that the games or lessons he sees are with youngster's like himself. Let him decide what he would like to do. My personal preference is to allow him only to play one sport or activity at a time. This young they need to learn to focus. Playing more than one activity at a time will overwhelm him and you. JMO.
Good luck!
D.H.