Oh boy Mike

...this is indeed a tough one.
This young one will need to eat *at least* 4 times a day -- and possibly more than that if it shows hypoglycemia, which is so common in yorkie puppies as you know. They should get Nutrical or similar asap, to have on hand.
They should not be taking this pup to dog parks, outdoor dog areas, or introducing to other dogs. Even if/when at the vet or a pet food store, they should not put the puppy on the floor.
Very important for them to know how to
assess vital signs, gums, etc:
HERE
This is
YT's new yorkie parent guide - and it has some very helpful links about all kinds of stuff:
HERE Vaccine info from this thread, which has add'l pertinent info:
Basic vaccine schedule is as follows (via Dr. Dodds): 9-10 weeks old - Distemper + Parvo
14-16 weeks old - same as above
20 weeks or older (or as required by your State Law): Rabies
Another Vaccine Schedule via WSAVA / VGG 8-9 weeks old - Distemper + Parvo
11-12 weeks old - same as above
14-16 weeks old - same as above
12 weeks or older - rabies
1 Year Boosters: at 1 year: Distemper + Parvo booster
at 1 year (at least 3wks apart from above shot): Rabies Booster (3 yr vaccine)