My Chinese geese are the best birds I've had. Ducks are sweet, but not so fond of touching. Chickens are funny and make lots of eggs. My geese, tho, they like to sit in my lap and lord it over each other. They run right up for petting and hugs and push each other out of the way. It's not that...
Feathers come slow for ducks. Should be a few poking out of the tail about now, and you'll start seeing more in a couple weeks.
As for sexing, liston to them. At about 3 or 4 months the boys have raspy soft quacks. When you hear a loud clear quacking like Donald Duck laughing look quick...