I've shot at lots of outdoor and indoor ranges. They are all different. Go with someone (to observe, not to shoot) and just watch what they do. If the Range Officer (R.O.) says something or you see something that you don't understand, ask.
Read the range rules, which will usually be posted on a big sign. If you have to go by yourself, leave your gear in the car and just observe the range through one cycle. (hot-cold-hot) Pay attention to how and when guns and ammo are handled. Pay attention to the transitions between hot and cold, when targets are changed, etc. Follow the instructions of the staff and R.O. and THINK before you do something.
When in doubt, ASK!