What Equipment do i need for high school men's lacrosse?

What size gloves do i need if i am a big kid, the people at the shop said 13' is good for me. Also what are some regulations I need to know? (sorry i am a begginer). Also which position requires most running and least running (besides goalie)? What is the best lacrosse defense stick? Ive been hearing good news about the Brine F-22 shaft