Around here good plumbers, electricians and hvac are in demand. Business classes are good for everyone. A really good equipment operator can always find work. Work ethic is a priority, he can be taught the trade but he's gotta show up. Wife is a RN, says therapy and PAs have a good future. If he likes construction start work with a reputable contractor, he'll just be labor but he can see the trades at work. Might give him some direction. A goal would be to be either an employer or a supervisor before he's 50. Trades help keep you active but crawling under a house to fix a broken sewer is for the young guys.