Our Shelby is 10 months today! - And she is our first dog/ yorkie - aside from great advice from her breeder Susan, her trainer, experienced friends and, of course, YorkieTalk, I found this book to be very helpful
Your Yorkshire Terrier Puppy Month By Month: Liz...
It only came out last year - (we found it while browsing at a bookstore) and we've found it to be very useful to understand what Shelby is going through as she goes through puppyhood.
Gives a ton of great tips throughout, too.
Good luck with the pup!
Alec