Hi Sandra and welcome to Yorkietalk. The biggest thing that comes to mind for me is the financial obligation that goes with a Yorkie. Out of all the dogs I have owned, my Yorkies ave cost me a lot more money. I call them "high maintenance" pups. Are you financially able to handle one?
Also, it seems that sometimes the tiny yorkies need a little more than the larger ones. And I can tell you even the bigger ones are still all yorkie!
Yorkies awe awesome pets! They can be a tad bit on the stubborn side. Ok ok they can be really stubborn!
A yorkie is a life long commitment. Make sure you spend some time and research the breed. Again, welcome to YT!