Youth Sports Photography Business?

My kids are in community youth sports. I have quite a bit of gear and enjoy capturing them play.

Recently a parent asked if I could shoot their kid for $40. Nothing huge, just them swinging at the baseball.

So... I thought, I'm here... Could I shoot all the kids, hand out business cards, link to pixieset and make some side cash?

Obviously I'd ask parents before taking their kids photo and inform the league.

But do I need to do amount else? I

t doesn't seem like I need a license to shoot Youth Sports on Public Fields.