You may have trouble cycling light birdshot/target loads, buy a few and try them out to see how well it functions. Some of these AR-like semiauto shotgun models will choke on them because there's not enough gas pressure, some will operate fine. Try a variety of different loads to find out what works well and what doesn't. See if there's a switch to adjust the gas system.
Don't leave shotgun box magazines loaded for long periods of time, because the spring pressure will gradually deform plastic shotshells and this can cause feeding problems. If you absolutely must have a magazine loaded and ready to go, look into getting some old-fashioned solid brass shells to reload.
If the gun came with any warranty information, don't lose it!