Welcome to YT, there is a wealth of information here and everyone is so nice. Honestly they are such smart dogs you might be suprised since she is already 16 weeks the training might go really easy for you. My brother got his first yorkie at about that age and same thing, he had been crate trained by the breeder and his Rocky just picked it right up when he got him home....of course he had accidents but for the most part it went easy.......I have to say KUDOS to you for making your girls do the research and book reports I think that is an AWESOME way of knowing what to expect/what they are getting in to....they it is not always fun, but that baby depends on them for food, water, etc. good for you, what a great way to instill responsibility for them.