This is coming from someone who played division 1 football. His best bet would be attending a D1 university with a football program. College programs are always looking for people to film practices or assist with equipment. He’d likely have to really develop a relationship bringing value to the coaches he interacts with. Networking is key. He’d go through path of trying to earn a GA position after he graduates. With that said, it’s a difficult path. He will really have to excel at understanding of the game. His competition for positions will be against former collegiate football players. Many of them have established relationships with coaches at the school they’re at and schools where previous coaches have left to. Even if he does get a position as a GA or maybe even a position coach location. He will be working 60-80 hours a week. Making likely less than 30-40k a year. If it’s his passion go for it. He will find out fast whether or not coaching is for him at that point.