Welcome to Yorkie Talk: There are articles called stickies at the top of every forum, with lots of great info in them. As well there is the YT library where you can find out lots about this breed. Some articles you will want to read is The cost of Owing a Dog, New Yorkie Parents.
But as another poster stated, you might want to read up on articles that describe are you "ready to own a dog?" That would be any dog of any breed.
In some ways puppies are like babies. They need to be fed, washed, taken to potty, on a regular schedule. They need to be trained, exercised, loved, and cared for. And yes there will be times that their needs come at times that are inconvenient for you. That is what you sign on for, when you purchase a dog. It is a life time commitment that you make when you purchase your pup.
For Yorkies you can find out more about the breed, and their health concerns, both here, and at
www.ytca.org. Then USA National club for the Yorkshire Terrier breed.
Take your time, research your heart and your willingness to make the 15 years or so commitment to a dog. It will be time well spent.