Eye testing is just one element to breeding. An important one but still only one.
You need to arm yourself with all the facts before you embark on this venture. You need to understand the risks to your girl and the puppies. While not common - you could lose your girl. You also need to understand the potential cost of all this.
Have a good look at all the COL FAQs inlcuding the ones on breeding. Get hold of a book called The Book of the Bitch by Kay White and take it from there. You need to know that your girl is a suitable candidate for breeding from and then choose the stud dog that will complement her breeding. it's not just a case of putting any Cocker to her.
There are certain elements of your posts that are just raising questions
Eg that you already have a stud dog.
Reputable breeders are out to improve the breed - what are your motives for breeding? I'm not saying they're dubious at all - just asking the question. It should be you that leads the way with deciding if you want to breed not someone else. As a first time breeder I can't stress enough the need to find yourself a good mentor who knows the breed inside out and all the pitfalls of breeding.
You will find COL members are passionate about protecting the breed and also advocating responsible breeding only. We will constructively challenge a person's plans to breed but only for the very best of reasons and to help anyone breed in the best way. It is not meant as personal criticism