MinnFinn

Find the spot where geese and ducks are feeding the evening before you plan to go out (next morning). That's the spot you need to set up you decoys 1-1.5 hrs before shooting time.
Very important! Wind needs to be from you back. Set up goose decoys in family group size spread out in a diagonal roughly "J" shape, with room for geese to land out in front of you. If they're (decoys) too close, geese will fly around you.
Keep the duck decoys (back and to side), if you want to use, away from the goose decoys. Generally, geese don't want to fly over ducks to land.
Make some sort of backboard to help keep your upper torso 30 degrees up so you can see. Cover yourself with burlap and wheat or whatever stubble is in the field among the decoys. Cover your face with face paint or cammo face cover. Even put a couple decoys around you and one on your lap.
A spinning wing duck decoy is great early to bring in ducks. Once ducks are done, take the spinner down. Use a flag when geese are a long ways out to get their attention. Once geese see your decoys and head your way, put the flag down. Use a few simple calls (clucks, double clucks, etc) answering them as they speak. Don't over call, especially once geese are on their final approach.. Just enough to let them know you're "real".
Then make sure you let them come in and don't move unnecessary or they'll bust you. They always look closer than they actually are. So, let them commit before you sit up to shoot.
If what you're doing isn't working after the first few flocks pass you by... See what's wrong and change quickly. I've even had to leave the decoys and get over into other cover that the first flocks start the pattern over. Once they start in a partern of flocks, most following flocks will match that pattern.
Have fun!