A college coach reached out to my son's HS coach. It was an asst coach, and I was not privy to the conversation, just told it happened. HS coach would have given him a good recommendation.
For those of you who have already had players that have been recruited, would you say this happens often or not so much unless there is serious interest? HS coach has only been contacted two other times from D1 coaches in the past 8 years.
As others have suggested here, it's a very good start.
While an indication of interest in your son as a player is important, of equal significance is a serious appraisal of the player's fit with the non-baseball aspects associated with the interested school. If it lines up well with the student's/player's academic inclinations, great. If the college offers a desirable social/extra-curricular environment, great.
Not that you've suggested that you have; but, don't allow yourself and your son to fall into the trap of placing so much significance on the baseball aspect that it ends up overshadowing the many other attributes that make a college experience the well-rounded environment that it has the potential to be. Baseball, today, may seem to be at the forefront of considerations; but, that can change overnight with an injury, a coach's departure, or the eventual realization that the college fit beyond baseball was overlooked.
Here's the flip side: If the program indicating an interest seems to line up well not only as a baseball program, but also as a college apart from baseball; see if you can identify some other schools/baseball programs that line up similarly with this one. If you can do that, you've created a universe of schools/programs that broaden the prospect of finding an eventual college home that fits athletically, scholastically, and socially.
Believe me, if you can concentrate on that combination of elements, you'll greatly increase the player's probability of ending up at a school that feels "right" for more than just the baseball; and that could make a huge difference in his experience.