Congrats on your new addition!
My boyfriend and I got our first yorkie over a year ago and he is my little baby boy!
We got him around 9-10 weeks and he was only about 2.2lbs. To be honest, kind of wish we would have waited to get him but we were first pick between 2 boys in the litter and the other people were coming back that weekend to get their boy so we didn't have much of a choice. Regardless, everything worked out well for us. Both my boyfriend and I work and are gone most of the day too. You should see if anyone can come over and play with him a little during the day while you are gone or if you cannot make it home during lunch.
Not going to lie, they are A LOT of work and unfortunately for us, Geno is verrry stubborn when it came to potty training so it's good that your guy is pad trained. We did neutering around 7 months as well as microchipped and had teeth pulled. I think microchipping is a must, but that's just me. I hope everything with your little guy goes awesome and so happy that you decided to join us on YorkieTalk! You can find so much information on here. It's amazing!
Although you already got your guy, I just want to let you know that researching and learning about Yorkies doesn't end here. I am constantly coming back on here to find out answers to different questions I have such as - my yorkie is doing this or that, is that normal? why won't he do this? why isn't he fully potty trained, ect - so definitely bookmark this site!