Strawberrieshk, welcome to YT. Yes, you are young but you are showing a lot of maturity coming on and asking for advice. People have given you a lot to consider and I too, think you should attend some dogs shows in you area. There, you can see what Yorkies are supposed to look like and talk with some breeder/exhibitors. Most are willing to offer advice and help if you make certain and talk to them after they have finished showing and are not busy. You might also enjoy junior handling,
http://www.canismajor.com/dog/jrhandlr.html This site will give you a little more information. You can also go to infodog.com and onofrio.com for listings of shows in your area. There is a lot to learn but you are starting out on the right track and definitely see if you can find a mentor who is close and willing to work with you. Good luck to you.