Need help selling ducks

I have 12 Appleyard ducklings I want to sell but I have never sold any before, they hatched on 1/1/13.

How old do they need to be to sell them? How much should I charge for them? and How do I tell the sex when they are so young?

A couple more details maybe, did someone give you these ducklings? I'm wondering how I can help you but I don't know how while trying to think of whats best for the ducks. I don't know your local market and if your targeting pet owners or meat producers. Youtube can help you with sexing your specific breed if that plays a role in your enterprise, are you a homesteader trying to go to a market like craigslist with your ducks? Sometimes another permie is just looking for a start and might give your ducks a great home, if it's just about the expedience to cash well then an open market like craigslist might be were your market lives. If the ducklings don't have a mother, then as long as there sold in groups to someone else with experience they should be ok.

Where are you located?

Appleyards are pretty difficult to sex before they start to change color.

We had 6 of them last year and it was almost 8 weeks before we knew what we had.

BTW, Appleyards are awesome ducks...