If you feel you are up to that challenge, then go about finding a dog or bitch that will be a good foundation for your breeding program. Do not purchase one male and one female puppy because you have no idea how they will turn out and if they will be a good match and balance each others' faults.
Very much everything Locke has said.
Let's take just one factor out of everything you should consider when planning a breeding; structure
You get a male and female puppy. You raise them up intending to breed them together some day. Those puppies can both be from well structured parents and still be an awful match for each other depending on their strengths and weaknesses.
If both of your dogs grow up to have weak pasterns, guess what all the puppies will inherit? And chances are, their weak pasterns will be at least as bad as the parents, if not worse.
Same for any other problem. Straight stifles (causes knee dislocations, and it's very common in the eastern LGDs), straight fronts, bowed elbows, east/west front feet, missing teeth, cryptorchidism, etc. are just a few examples of inherited faults found in all breeds. And that's only structural. It doesn't even take into account temperament or health, or breed specific conformation.
It's much better to start with one dog, invest a lot of time into training, testing, and proving that dog. Then once you are certain they are worth breeding, search for a compatible mate that will complement your dog's strengths and weaknesses.
Then since you are breeding to improve, you keep the best of that litter for your next generation. That's one of the good things about starting out with few dogs. You have room to improve your breeding program.
Also, you're talking about a lot of dogs. I got my dog from someone who had 9 borzois. But borzois are generally not dog aggressive or same sex aggressive. Her dogs all live in her house, and all get to spend lots of time with her and not have to be separated.
You say you already have 6 dogs. You're talking about starting a kennel with 14 large, dog aggressive, same sex aggressive breeds. Even if you move your bed out to the kennel and sleep out there with the dogs, that doesn't give you enough time to give them enough individual attention to "spoil" them. Most of them will have to be kept separate at all times. That is very sad, especially for breeds that bond so strongly and are so devoted to their people.
I kennel sat for someone with 10 dogs once. I didn't have a day job so had all day to spend with them. That was overwhelming, not fun, and was really hard because the males could not be loose together. 10 adult dogs make a lot of poop to shovel every day. Food preparation/serving alone took me and hour in the morning and an hour every evening because everyone had different amounts, supplements, and medications to be measured out.
Having raised a litter of puppies, I can't imagine having any time to spend with that many adults with puppies on the ground. I only have 2 dogs, and my poor male was horribly lonely while my girl and I were preoccupied with the babies.
Another thing to keep in mind is female dogs synchronize being in heat when kept around each other. So if you have many females, you won't have the option of spacing out your litters because they will all come into heat at the same time.
There is just a lot to learn, and it takes a long time to take it all in. I really encourage you to find a good mentor with the same values as you. There are experienced kennel people out there that you can learn some things from, but they do things like the people you saved Volka from and don't worry about issues like excess puppies or vet bills or aging dogs because they just kill/cull the animals with problems and dispose of older females when they stop being profitable.
