Never wash hatching eggs here, doesn't matter chicken, duck, quail. I would not leave eggs with her if she is not sitting on them. you collect the eggs putting them on the counter pointy end down in an egg carton. Prop one end of the carton up in the morning and switch to other end at night. This is turning the eggs prior to setting in the incubator. Collect how ever many you wish to try and incubate from a 4-7 day period. Just remember that how ever many you set, usually not all will hatch. Have plans for what you will do with the ducklings when they hatch. They will need a brooder, heat lamp, food and shallow water container. Ducklings are messy with their food and water, and need to be kept warm, so no just putting them outside once they hatch. You will need to, and want to change the brooder bedding a couple of times a day so they aren't on wet bedding and to help keep the smell down.