Gio's Mamamia,
Most of what you describe is very normal puppy behavior. The only aspect that I would be concerned about is the "object guarding" - growling and snapping when you try to take something away. You want to do something about that before it escalates, but the good news is that this CAN be treated.
I don't have time right now, but I'll post some suggestions for you later. Or, perhaps YorkieMum will get back to you before me....
[In the meantime, what I absolutely do NOT recommend you use is the "alpha roll" that many members here advocate. I believe it is likely to make your pup worse.]
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