I don't know if the OP will read this, but for educational purposes, I'll take a stab at it.
1. Your bitch should be at least 2 years old. But more importantly, she (and the male) should be health tested first. This does not mean taking them to the vet and having them pronounced in good general health. It means Baer testing to be sure their hearing is normal, CERF testing to be sure their eyes are normal. These tests are especially important on a blue dog with blue eyes. You should also consider blood tests to be sure liver and kidney function are normal.
2 and 3 kind of go together. It's never a good idea to breed solely for color. You usually end up with the color you want, but at the expense of health and soundness. One serious problem you may have is that you're breeding for blue. Blue with blue eyes is considered a lethal gene in many breeds, meaning if you double up on it you may have puppies that die in utero, or you may have puppies that are born deaf and/or blind. You may have puppies that are born with no eyes. Is this something you want to risk?
Inbreeding, like you're contemplating, should only be undertaken if you have the experience and knowledge to know what you're getting into. Experienced breeders usually do a lot of research before they attempt it. When you inbreed you're doubling up on a lot of genes, both good and bad. You need to know about the bad ones, and what can happen.
Also keep in mind that your dogs are both mixed breeds. What you'll get if you breed them is a mixed bag. The puppies will not receive the same genes; some may be more like one breed or the other, while some will look more like the parents.
4. Most small breed females have their first season between 6 and 12 months. And she's not old enough to have puppies yet. Wait until she's closer to 2 years. Get those health tests done. If you really just HAVE to breed her, have your vet check her about 5 days after she starts bleeding. That will give you an idea of how close she is to being fertile.
Other things to consider before you do the deed: Are you financially able to pay for a c-section if it's necessary? Are you prepared to deal with the loss of your bitch? Some do die. You have a small breed, and they're prone to developing eclampsia after they whelp. You need to learn about that, how to recognize the symptoms, and be prepared to act fast if you want to save her life. Do you know how to recognize when a whelping bitch is in trouble and needs help? Do you know how to deliver a stuck pup? Do you have the time to devote to raising a litter of pups? It's a lot of work, and takes a lot of time. Do you have the time and financial resources to deal with sick puppies or puppies that need to be bottle fed? Can you afford all of the extra food, the vaccinations, health checks, worming?
These are all questions you need to answer for yourself, and realistically look at what you're doing. Breeding is a time consuming, expensive proposition if you intend to do it right. You can do everything right, and still have everything go wrong. But if you don't intend to do it right, you shouldn't do it at all.
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