How to help my little brother play college, minor, or major league baseball?

My little brother is currently in 5th grade and is a baseball phenom for his age. In his rec league he is easily the best pitcher with good speed and unbelievable control as he walks maybe 1 or 2 batters in about 5 or 6 innings. People have said he would be the best pitcher in the leagues of 6th 7th and 8th graders but they wont let him move up to the upper leagues. He doesnt hit with the most power but gets good contact and is over 5 foot and is only 10 so the power should come. He also plays aau and would start for any auu team in the country at any position and probably a top 3 pitcher. So when do you start trying to get colleges to notice you or even professional? because Jordan Schaeefer of the Atlanta Braves minor league system was considered the best 13 year old player in the US.