No you need to have a female and male duck to have baby ducks.
You can keep brown eggs refrigerated for at least 2-4 days.
the eggs need to be kept warm in order to mature, check out the link I provided
I think that you can just leave them in a cool place, because eggs need to be warm to hatch.
Throw out the eggs they are rotten, your duck should not starve to death anyway.
If it is an egg custard, it should be refrigerated.
You need duck eggs and an incubator. See discussion.
powdered eggs are a much more stable product than liquid eggs and do not need to be refrigerated
This has been known to happen. Sometimes another duck with get "cannibalistic" as some call it and begin eating eggs. it has been said that males will destroy eggs with male ducklings inside, but this is not proven. Your ducks may need calcium, and this is why they are breaking other eggs. Try feeding shell grit.
No if you touch duck eggs or alert the duck to the fact you know where her best is she may leave and or abandon the eggs
Obviously the duck comes first because eggs need a mother duck to sit on them to keep it warm otherwise the baby duck still in its egg would freeze to death.
Yes, it can but the eggs,if some will need a home so that they can get used to.