Just bought my tickets for Baltimore this morning

It was such an impulsive decision but I'm living. I've never been to a concert so idk what to do. When do I get there? It says 7:30 on he tickets but people say she took the stage at 9:30. Should I record with my phone or actual camera? I'm in the field so I'm not too far from the stage. I'm going alone so maybe I should prepare to hook up with someone? Unless it's not that kinda party. Somebody let a niglet know.