Contact the schools he is interested in and sees himself attending/playing for. You are wasting everyone's time if you reach out to several schools you never intend to attend just to get a visit or get experience with the process.If he has one or two he can "fall back on" as a back up plan, visit those first but be upfront that you are early in the process.
www.recruitmenow.org is a low cost website and has a national database of coaches and you can blast 20 emails in one shot to schools of interest. They have form letters, and every email has your son's page link attached. You can also build a profile to included video for those coaches to watch. If the school or a coach clicks your link and visits your page, then they are logged and you can see how many times they visit and how many pages they view. Great tool, bargain price of $49 annually and it will augment what you do independently to land your kid a scholarship. I used this after talking with several friends and it helped us get my son a D1 offer and he accepted. It just so happens the school who looked at his profile the most is who landed him. Good luck!