Welcome to the site... you found the right place.
In addition to the responses you get to your post, you can search related posts and find an abundance of info.
To add to what you've heard already..
If the early interest is any indication, your son is likely to get a fair amount of attention and thus, be pulled in many directions. Things can get really busy fall/winter Junior year, so it will take advanced planning to find that month or two to take off and give the arm a rest. You'll also have to figure out what his HS does during fall/winter as well. It is likely that you will have to draw a line in the sand and stick to it - saying no to some of the opportunities that seem so important at that moment.
The scouts that run the scout teams are usually quite well connected to colleges as well, so use those resources. Also, find out what events his top target schools will be attending so you can maximize any trips you do make.
You already have a few key events that happen in your back yard and if you are doing PG events as well with the scout team, he will be getting a good dose of exposure. You just have to determine if dream school/s are realistic match and connect the dots.