ive had yorkies for years , my first when i was just 8 and im now 32.
i have 3 yorkies now and a shih tzu, i think one dog left for such a long time on its own is not a good idea but if you had 2 it would be fine as they would keep each other company.
i dont think it would be a good idea to get a pup as they do take up a lot of your time and if you dont want to have things ruined dont get a pup.
i also dont think it would be a good idea to get a tiny yorkie as you really need to know what you are doing with them or you will have problems.
i would say get 2 larger yorkies from a rescue home, they will of hopefuly got over all the puppy problems, be trained somewhat, keep each other company when your not there but also will not need as much of your time as they have each other.
as for all the other stuff needed for a yorkie i wouldnt say they need anything more than any other breed of dog, i clip there hair my self, clip there nails my self, and i dont have a stroller, pet bag or clothes for mine, they would go mad if i tryed to put them in any of them
if you have a larger yorkie you also wont have a problem with injurys or low blood suger.
also dont be fooled in to thinking you wont fall in love with a yorkie cos my partner never liked yorkies but fell in love with mine within an hour of meeting them and now calls his self daddy