RE: First Dove opener.
Welcome to dove hunting on public land! I grew up hunting in southern Ohio and always had private land but spent the last 3 years in east Tennessee. It's just like you described in TN...and I didn't like it one bit. Don't hesitate one second to tell people about it if you see them being unsafe. I don't know how many low shots I've seen in public fields in TN. I hunt with my Weim during dove season to get him ready for quail season, and I get real mad when people are shooting a couple feet over his head (which happens to be about eye level with my head)!
My advice would be to find some good private land even if the birds are so plentiful. Dove hunting is a great way to get a youth hooked on bird hunting, and a great way to learn good shooting and safety habits. Good luck