JMO, but I think a Yorkie is a rather tough breed for a first time dog owner. They are incredibly smart, which leads them to getting in to all kinds of trouble. They are also really difficult to house break.
You say you don't want an adult because you want to mould the personality. I would encourage you to revisit that idea. It's really easy for a young pup (of ANY breed) to go "to the dark side" so to speak, because their owner wasn't a very strong leader when they were a puppy. Nipping, growling and food aggression issues can occur, especially if you are afraid of dogs. They can also get over protective if they perceive you as the weaker member. A slightly older dog (a year or so) might be a better fit for you, especially if you work with a good rescue who can help match the personality of the dog to your specific needs. They are still young and playful, but hopefully some of the more challenging habits have been worked out of them.
What ever you decide, I highly recommend working with a trainer early on to help you gain confidence and have a positive bonding experience with your dog.
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