Theresa,
I was just like you...mostly mixed breeds from the shelter...and my last one was mostly Yorkie, but he weighed about 10 pounds. Since I'd always wanted one...I just jumped in and bought one. Thankfully, I managed to find a good home breeder close by. I didn't know about YorkieTalk then.
If you haven't had any kind of puppy in a while, you're in for some surprises!
You have all the usual stuff, only with a smarter, more stubborn baby! As with anything else, every dog and every owner is different. But I don't regret it a bit!!
Make sure you check ALL the sub-forums...You'll learn tons here before you make the plunge...