Welcome to Yorkie Talk. I'm sorry things didn't work out to have your babies spayed/neutered before your girl got pregnant. You have found a wonderful board here with many breeders and pet owners who are always willing to help.
Here is a website I have found to be a wonderful resource for all kinds of information regarding pregnancy, whelping and care of the puppies...along with tons of other information like supplies you will need to have on hand. Take some time to look it over, read the articles and watch the videos...you'll be surprised how much you'll learn! I have a female who is expecting her first litter in a few days so I know how you feel...I've spent a lot of time on this website! Good luck...I hope all goes well for your girl and for you.
Canine Reproduction Video and Book on Breeding and Whelping dogs by Debbie Jensen for dog breeders and Whelping Supplies needed to deliver puppies.