If your son's doing fall ball, take some snippets of video -- some coaches like game footage, others prefer practice video. Even if they've seen him at a showcase, the coaches like you to send a little video. The more you have to choose from, the better.
Good luck! Sounds like a great start to recruiting! Enjoy the process with your son and don't assume you know what he wants. It will be a great learning process and bonding experience for you both.