RE: New to waterfowling...need help
Spinning wing decoys do not scare geese. I've killed geese with a couple of mojo's running. I usually set my ducks up about 20 yards behind me. Motion in goose decoys is crucial. Geese key in on the motion when they are checking out your spread. Lots of different companies make motion bases, necks, heads, and flapping wings.
Around here field edges work ok in the early season but the geese seem to stay away from them. set up in the middle of the field or on the highest point. The best place is to set up where the birds were the night before.
As for hitting them get them in as close as possible. Relax and aim for the head.