A pork shoulder is also fairly forgiving, might want to start with something that’ll help you get your new rig dialed in. I think chicken isn’t too bad either, esp. if brined. That said, all you do with jerky is smoke the water out to desired level of moisture in the meat, so that’ll be a good one too.
Get a good digital thermometer, the kind that can measure ambient temp of the grill at the cooking surface, and one that has a probe which goes into the meat. That part is almost as important as the smoker itself. Good luck and good eats!
Joel