Well as you scout and witness the birds you see - place your decoys likewise.
At times I use 1 or 2 feeding hens and then one hen at attention. Don't put them to close together either. Birds when nervous flock tightly together before flight. Make your set-up look as natural as you can.
AND always pay attention to safety! We do have hunters out there that do hunt decoys and it is not fun!
JW