at the end of the day, just go out and try, all the formations are just examples of what have worked for other people, they may, or may not work for you, maybe start off with a basic U shape, put the bouncers at the ends, as if they were pidgeons coming into land, you'll want the curve of the U around 25yds away from your hide, but again, these are just examples that have worked for me, once your out in the field and trying patterns out, you'll find one that in your eye's, brings the birds in, and you'll tend to stick to that, until you have a bad day, then try another, I started with 12 decoy