A breeder I know has a questionnaire on her site. Go to
www.dandieyorkies.com. I would also ask about whether they have a pool or other water feature that the puppy could fall into? I would spend time training them about yorkies if they have never owned one before. At least two hours I would gues and then refer them to YT and be available by pnone for any other Qs that may come up later.
Question out of curiosity:
Since your mentor gave him to you why doesn't she trade you another male that would suit your needs as you both had planned since he got too big? Then she could use her resources to sell him to a pet home. Seems like a better solution to me.