Great info from Branson...
My add...
Once he has developed a target school list, he will need to carefully map out that showcase/camp schedule. He will need to be aware that most schools will gladly take his money and have him attend camp, so, sending video and asking the right questions to determine genuine interest on the part of the school will be very important. Otherwise, he can find himself having attended 1/2 dozen college camps with no real interest or direction. If he narrows things regionally and is able to go to a credible multi-school event with several schools on his list, this can be an effective path. Again, prior communication and gauge of reciprocal interest is key.
Another "awareness" note - read up here on D3's. There is no athletic $ but typically a good amount of academic and other $. They are also typically fairly high academic, smaller private schools. So, the result of this combination is often that there is motivation to recruit lots of players (to bump enrollment $ coming in) even if there is only modest interest in the player's baseball skill set. So, when the time comes, it is important to know the right questions to ask to determine exactly where the school sees the player fitting into the baseball program. That information can be found here.
Oh, and this may be challenging since he just moved but try to figure out good credible resources/connections to help him identify where he belongs and maybe put him in touch with the right people, events, travel programs, etc. This can be travel coaches, instructors, HS coaches, scouts, etc. that are familiar with him.