oh no. was this an accident? i'm not sure about asking prices, but I would find you someone who is a really reputable breeder either on here or someone nearby on the YTCA website and practically move in because this is going to be a long ride. dog pregnancies can be much more complicated than even human ones and we wouldn't want anything bad to happen to your girl.
Yorkshire Terrier Club of America About The Club
find someone to help with this time in her life so it goes smoothly and you don't loose her or the puppies...after everything goes well and no lives are lost then i would start to think more about giving them to the best homes you can find. note that i said GIVING them. i don't know if you should be selling them off, but again i'd ask a professional reputable breeder about this as well.
thanks and good luck i hope it goes ok. i would defin. spay/neuter after this. esp. ur male so he's not doing this to another person's yorkie out there.