My little sister was home schooled for the primary school years. But as a suggestion, You should get together with the school you pick and plan his IEP-(Individualized Education Program)
Maybe ask about the possibility of a one on one para/aide. Someone that could escort him to and from classes, even sit in classes and help him. I have seen this done in a few schools I've been to. It should be available in a large school, with setting/situations that can be over stimulating. Also having them put a risk(concerns, dangers)/care (how to prevent and handle) plan into his IEP so his teachers/aides will know what to do.