Welcome! And first, thank you for your service to the country.
I'm sure you'll find any/all info you'll need here. If not, someone will probably point you to where you need to go. Regarding your question about food, you should feed her what she's been eating unless you feel the quality isn't good and want something better. If you go to the "Yorkie Health & Diet", you'll find a lot of helpful info. If you do decide to change food, please remember to do it gradually. Yorkies tend to have a sensitive tummy.
Not sure if she's potty trained yet but that could be one of the more difficult things. Good socialization is important as well as training her the basics like sit, stay, leave it, etc.. You can look up youtube on these type of training.
You'll have so much fun with her!