Usually if they are brown eggs you will hatch out some type of Red Sex Link all though you will not be able to sex the chicks because they do not breed true since they are a cross. If they are white then they are almost guranteed to be leghorns. Good luck I know plenty of people that have had good luck with store bought fertilized eggs. PLEASE keep us updated with them. I am actually hatching a couple of eggs from my Red Sex Links and my Blue Orpington Roo should be an interesting mutt that lays really large brown eggs and hopefully a lot of them!