Breeding purebreds always comes with great responsibility. Making a quick profit should never be your priority, for the lives of your pets are at stake. Instead, try to focus on matching Flat Coated Retriever dams and sires by the soundness of their health, stable temperament, type, soundness, and working ability.
Breeding your Flat Coated Retriever isn't as simple as putting a male and female together. That is called irresponsibility. Try to learn all you can about the Flat Coated Retriever breed first - what its conformation or dog breed standards are, its desired temperament and its genetic make-up (in cases of inherited diseases and sickness.)
A Flat Coated Retriever is very different from other retrievers, and when you do breed your pets, you have to make sure that this distinction will be evident in the litters your pets produce. Probably a great reference material for learning is to go and visit other Flat Coated Retriever breeders in your area. It is best to ask them direct questions about breeding procedures and what should and should not be done under the circumstances. Most Flat Coated Retriever breeders will be happy enough to share their know-how because by sharing their knowledge with you, they are actually helping to maintain the soundness of the quality of the Flat Coated Retriever breed.
There are also boundless materials on the Internet and in books about how to breed Flat Coated Retrievers. You can look into these as sources of basic information. Do not take one book and make it your biblical reference to all things Flat Coated Retriever. Definitely, a single book cannot answer all your Flat Coated Retriever questions in terms of breeding. It can give you an insight as to an angle of a certain idea, but to verify the authenticity of that insight, you still have to do a lot of research. E-books or other reference materials on the Internet should also only be sources of basic information. The truth is nothing is more valuable or enriching than the first hand account and advice of long time Flat Coated Retriever breeders.
Try to learn the language of Flat Coated Retriever breeders: the so-called breeders' dog-speak. If you love Flat Coated Retrievers, you have to know how to best describe your pet in the universal language of dog breeding. It will be easier when you are deciphering reference materials in books or elsewhere. When the information calls for a Flat Coated Retriever that "has a flowing gait that is gradual, slight with a barely perceptible stop" - well, you get the picture.
Breeding Flat Coated Retrievers because you want to have puppies should not be synonymous with breeding because you want to sell puppies. Professional breeders have one thing that you probably do not have as of the moment: a foundation bitch or dam. The dam will act as your prospective brood bitch, and it should carry most if not all the desirable qualities you wish to see in the litters she produces. Choosing a sire is also a risky business, and you may still want to ask the local Flat Coated Retriever breeders in your area where you can find a healthy stud for your dam.
Always bear in mind that responsible and selective breeding is the key to a healthy litter.