That's just it we would need to know land or water.
With a dozen though a good early season spread would be a C or V shaped layout.
Put yourself at the middle of the curve, or the point opposite the opening. This works great in corn and wheat fields if your wearing camo that matches. Make sure you leave the open side wide enough to allow at least a dozen or so geese room to land other wise they will land short on one of the sides.
Another option is the two groups as said above.
When you get more a good layout is an X shaped one with yourself in the middle of the X . This gives them some options on were to land.
Make sure you scout the night before and know the specific spot they are landing. In bigger fields you can be fubar'd because they landed 100yds to the left of the hump instead of on the hump.
Make sure your C or V layout points into the wind and you lie with your back to the wind.
If there is a hump in the field and the geese are landing close to it, set up in a way to allow the geese to come up the hill to you, NEVER be on the other side of the hill cause they get all messed up trying to land, and will either take off or land somewhere else in the field.