One main thing in Utah is, get use to people walking threw your setup at the moment that the shooting hours start. Happens every year, also get use to someone setting up 50 yds down from you. The best advice would be find someone with a field thats private, get permission to hunt on it and have fun, clean up your shells and keep the landowner happy, so you can return every year after.
12 Gauge is the best but a 20 will also work, auto or pump, either work, lots of decoys that look real, G+H are nice ones, good waders and a warm coat for when it gets cold and a light weight one or long sleeve shirt work for the warmer months. Lots of bug spray.