Have him play all sports. BB will help him see the field. FB will teach him how to deliver and absorb contact. My son also was an elite junior tennis player that helped with with eye to hand coordination.
Long Island should be loaded with summer camps, where he will exposed to kids with advanced skills. There are more teams with quality coaches as lacrosse has become more popular. As he gets older, look for elite travel teams that now are similar to AAU BB teams. North Jersey and the Hudson Valley will also have camps for all ages. UVA still runs a program in Harlem
At 5 the practice wall should be used as much as possible. Elite players are essentially ambidextrous, so there should be as much off hand practice as dominant hand
As a HS Freshman, Hopkins Coach Petramalla thought my son was left handed, so off hand practice is important. My son could shoot 110mph righthanded and over 100mph lefthanded. At half time of the 2006 National Championship ESPN showed a pre-taped film of him shooting, with the announcer calling where to place the ball-each shot was in the exact corner of the cage that was called. Quint Kessenich simply was dumbfounded