Congratulations on your new baby! It is so much fun shopping for a new addition. Here are my suggestions:
1) Find a good quality harness that doesn't touch the delicate neck area. There are several venders here at YT that can help you out -- I am one of them. Please check the Yorkie Products for Sale and the Featured Yorkie Products for Sale and shop to your heart's content
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2) Many of us love MinkSheen shampoo -- they have a sale going on right now...
3) My gang loves the Dr. Noy's Material Dog Tiny Squeeky toys with replaceable squeekers.
4) I have been feeding Canidae All Life Stages for 2 years. It is a super-premium dog food....
For most things you will find your "picks" by trial and error.