So, if this is your goal plan A. I would try to let hens sit and do it themselves as that is the easiest and very rewarding watching mamma and littles. Plan B have the incubator ready to put your eggs in. Plan C go get TSC chicks if A. B. fails. One other thing to note is how long has your hens...
Just know that you can't make a hen go broody and sit. You can increase your odds by leaving eggs gather in a nest but not all hens will go broody, so if you plan on that you might want to have an incubator ready.