You do realise there is a difference between a Working Cocker and Show Cocker?...you can work either but there is quite a difference which would influence the kind of Stud you would use.
How is she doing in the show ring (assuming she is a show dog) ?? The only responsible reason for breeding is to improve the breed; so proven show results (or proven working skills for a working line) would be the first thing I would look for in the parents of any puppies as well as clear health testing for PRA and preferably hip scoring as well.
I would look for a breeder who was an active member of the Cocker Spaniel Club (or other breed club
), and who has the experience to offer support and advice after the pup came home with me.
If you are confident that you and your bitch can offer this, then you are likely to find loving new homes for all the puppies that your bitch has; assuming that they and she survive pregancy and birth
I'm not alone in my desire to find a healthy and reputably bred puppy - those people who don't look for these things tend to have done less research, and may be less committed to a puppy - is this the type of home you want your puppies to go to??