I hope you will reconsider breeding Miley. She is going to be way too small to breed and there's a large possibility she could die giving birth, or at the very least, have to have a C section. You could possibly lose all the pups too because you won't have whelping experience, and might wait too late to get Miley to the vet. I personally would never risk a dog's life that I loved just to have a litter of puppies. I am not trying to be mean to you. There truly is a big risk of losing Miley since she's so small. Think how much that would hurt you to lose her.
I have been a dog and horse breeder since 1982 and am very experienced, but I have no desire to breed yorkies. My dog is a champion sired male and most of his pedigree is red, meaning most of his ancestors were champion show dogs. And he is gorgeous! But, I still had him neutered at eight months old because I did not want to breed yorkies, and I sure didn't want a male dog lifting his leg peeing in my home.
I think a wonderful thing you could do with Miley that you'd both enjoy is turn her into a therapy dog. You could teach her some tricks, dress her up, and take her to hospitals and nursing homes so people who are sick could enjoy her too. When my nephew was eight years old he was diagnosed with cancer and was extremely sick in the children's hospital. While he was in the hospital, the only bright moment of his stay was when some wonderful people brought their therapy dogs to the hospital to entertain the kids. The dogs did tricks for the children, and later they were able to get up in the beds and cuddle with the sick kids. I swear, tears were pouring down my cheeks, seeing how much joy a little Yorkie brought to my nephew when he was so very sick. That's what I want to do with my yorkie. It would probably bring a lot of joy to your life too.
I know an excellent dog trainer in Dallas whom I'm sure could teach you how to train Miley. I've seen her do amazing things with dogs. Her name is Carla Collins and her training school is Sit Means Sit. Here is her website.
http://www.sitmeanssit.com/dog-train...-dallas-texas/ Please email her to see if she'll be having classes in your area. I know she trains in the Frisco area. She is a wonderful person and could help you so much. And please contact the handler Mardelin mentioned. He could help you more than you can imagine! I would have loved to have met a respected handler when I was 11 years old and learned to show dogs that young.
I would like to say I'm really proud of you for starting so young, learning about raising dogs, showing dogs, training dogs, and breeding dogs. I would have loved to have gotten into showing when I was your age, instead of in my late 20's. I hope you will try to learn all you can, and try not to be impatient. I know it's hard but you have so much potential, and who knows. Some day in the future you could be a top show dog handler, a top breeder, or a top obedience trainer. Use the resources so readily available to you in the DFW metroplex and you will do great. Best of luck to you!!