Oh, goodness...there is sooooo much to know! My dog I have (9 months old) is my first dog/yorkie ever too, so I know where you're coming from! There's a TON to learn, but you've come to the right place! YT is absolutely FULL of information to learn. If you ever have a question about something, most likely there are a plethera of answers if you use the search box on the main page.
Okay...what should I tell you... ?? First of all, it's very important to feed your dog a very high quality food. I didn't know this until I got Kobi, but almost every commercial brand is awful quality. You can go to dogfoodanalysis.com and see some of the best ones listed.
Also, yorkies should always be on a harness, not a collar, because they get collapsed tracheas and harnesses don't push on them.
Well, I'm drawing a blank for some reason right now

, but hopefully someone can pick up where I left off....
I wish you all the best, and NEVER be afraid to ask questions here! Good luck, and of course, WELCOME TO YT!!!