You need to candle them to see what the state of the air cells are and if there are any hairline cracks from shipping or other deformities that would make the egg undesirable for hatching (overly pourous, shell defects from laying). Eliminate those with cracks and serious shell imperfections (hopefully the breeder sent only quality eggs).
A good air cell will be attached at the fat end of the egg...that little pocket you see at the fat end when you crack open an egg.
A detached air cell will roll with the egg as you turn it acting like the bubble on a carpenter's level.
Mark any eggs with detached air cells, then place eggs fat side up (pointy side down) in an egg carton for 24 hours. Recheck eggs for any detached air cells, eliminate those which still have detached air cells. (You may choose to let them sit for another 24 to 48 hours, but generally if they haven't settled by 24 hours, they aren't).
Set the good eggs with the hen. I've done it at night and during the day depending upon the hen. Truly broody hens don't mind when you hand them eggs. They will even roll them under for you and peck at you to go away and let them work.
Happy hatching! Keep us posted on the progress.
Edited by Lady of McCamley - 5/10/16 at 4:51am