Hi Mary, welcome to YT!!! It's nice to know he (name?) has found a loving family to give him all the love, care and attention he so deserves and needs.
I also rehomed to adult yorkies, Prissie and Might, Prissie was 2 and Might was a few months shy of being 3. I think they transitioned fairly well, the first day was a little hard as I already had Miko and Kylie, who I had since they were puppies and were now the same age as Prissie and Might. Might attached himself to me and wouldn't let Miko get near me, it was so sad to see my poor Miko wanting to get close to me and hearing Might growl at him. At first I didn't think it would work out, but within a few days everything was fine and that was 3 years ago!
That's good that you are getting all his belongings, they will make him feel a little more at ease, patience and alot of loving and attention are the key to make the transition go well. He will definitely attach himself to one person, the person that makes him feel more safe until he feels more secure in his new home.
Good luck, there is a world of information here on YT and so many helpful members, just ask anything we are all here to help. No matter how meaningless you might think the question is, it's like the saying goes the only stupid question is the one not asked.
Have fun with your new little guy. Can't wait to see pics!!