Trying to start gaining experience coaching

I’m not trying to coach NFL teams necessarily because I don’t have to skill set yet or reputation.

But I am trying to get into coaching football since it’s always been an interest of mine and just kinda want a side gig that feels rewarding - not worried about monetarily right now.

How do I start? Do I just reach out to schools to see if they are looking? I have a prior military background and business owner so I think I could show myself as a leader and visionary for inspiring.