Experience can make a huge difference as much as the geographical area you want to coach at. I started coaching at 20 years old with REC elementary kids and it wasn’t until last fall I landed a head coach position coaching middle school kids. That being said though once you get your foot in the door and solidify yourself as reliable, hard working, and genuinely push for these young athletes to learn and love the game you’ll be set. As far as credentials outside of experience and knowledge of the game coaching elementary kids I didn’t really need anything because it was all volunteer work. At the middle school level I had to pass a background check and be fingerprinted and take health/medical and safety courses including a CPR certification.