Welcome to YT
! Your Joey sounds adorable, and allll yorkie!
For the barking, some people find that startling them while at the same time saying "no bark" helps -- like startling them w/ a can filled w/ pennies and shaking it...this may help. My Wylie is a major barker and we have to help him know when to stop as well. Some dogs are just more barky than others.
As for potty training...sigh...I'm not a good trainer in that area.
As for the other command training, it's a matter of repetition, repetition, repetition and consistency...keep doing it, and it will sink in...hopefully
!