Don’t let him move to Brooklyn! And probably not Monsey or Lakewood either. Brooklyn is impossible for housing and financially, not to mention that it’s very, very easy to simply get lost in the crowd.
He should investigate the various out-of-town communities on the East Coast. Just off the top of my head, there are Scranton and Philadelphia in PA, Baltimore and Silver Spring in Maryland, Richmond VA, and Atlanta. These are all normal-sized frum communities where each individual counts, not a human sea like New York. He could possibly contact the local Agudahs in these communities, who could give him contacts for information.
No, it’s not easy to get benefits moving in from out of state. Better not to count on it.
Good luck to him!