Let us know how the mtg went.
Soon after the meeting while it's fresh in your mind re-vist the discussions and write down a couple follow-up questions you did not ask. Then is the time to have your son call the coach back with those questions. Follow-up questions not only address new issues but will also send a message to the coach that your son has a proactive appproach to situations, and also shows a sincere interest.
Both official school vists and home visits are a "selling" game in the coaches eyes. He is attempting to sell his program. My thought is that the player is also selling himself. In the business world initial impressions are critical, but, followup communication sells product, and makes lasting impressions.