You will most likely be renting the shooting lane by the hour or half hour. To make the most of your time, have your range bag well organized so you can reload quickly and safely. Make sure you have eye protection and I recommend electronic muffs so you can hear any commands from the range boss. (under $30 at Menards)
Read and obey the range rules. You might want to bring along a big piece of cardboard as a back stop for your paper target. Some ranges provide this free and others do not. If you have to pay by the hour or half hour some ranges will allow you to preload your mags before your time starts. If not, or you have a limited number of mags, buy the Uplula magazine loader if you don't already have one. It will allow you to load your magazines much more quickly.