One of the best suggestions around is to use your binocs and look at the local flocks that are really setting up now.
What I've found is that the majority of the birds will work into the wind. That being said, the birds that are feeding are looking at the ground and milling around while they eat. As to the number of sentries from 1 to 6 or 10 is a good mix. When setting up be sure to keep plenty of space between the dekes. Nervous birds seem to bunch up and have more sentries.
Good luck
What I've found is that the majority of the birds will work into the wind. That being said, the birds that are feeding are looking at the ground and milling around while they eat. As to the number of sentries from 1 to 6 or 10 is a good mix. When setting up be sure to keep plenty of space between the dekes. Nervous birds seem to bunch up and have more sentries.
Good luck