I once read here the excellent advice that a kid (and parent) should not get too stressed out about a coach phone call, because coaches are used to talking to inarticulate 17-year-olds and they will do most of the talking, or at least lead the conversation. That was true, in our experience; if they are calling, they are trying to sell their school and gauge your interest, so pretty much all he had time to say was, "that sounds great." It was always the case that, at the end of the conversation, the coach would ask if my son had any questions - so it might be good to have a question or two ready, although I think my son didn't always have one, in which case I seem to remember hearing him say "no thanks, you've answered all my questions."