I am new to hatching eggs help? "DUCKS"

[thatduckguyy]

This is my first time hatching duck eggs. It is a bit trickier then I thought! Yesterday I threw out a egg that I thought was rotten and the rest of the eggs are fine.. atleast I think. They are a bit smelly too, could this be because of the other egg? Right now its day 8 of incubation, I candled them I can see veins and the embryo. Is it suppose to move by itself because the baby isn't moving? Its only if I wiggle the egg around. I just want to know if their alright. Also could I have some info about what to do once they hatch? If they have trouble can I help? Also how long do I wait to put them in their brooder box? Just try to leave all the info you can, please and thank you!