WOW!
I am truely saddened by your words. First of all i truely hope you don't hit your dog with the leather belt
Second maybe you can try some bitter apple spray to help with the chewing. You get it at your local pet store they don't like the taste so they don't chew on it. Also try some bully sticks they are chew sticks and the dogs truely love them you can get them at your pet store as well this might help with the chewing of everything else. Potty training is a difficult one Yorkies as do a lot of small dogs have a hard time with this you really need to be patient. I truely hope you can come to peace with your dog or please rehome him it doesn't sound like there is a lot of love going on and maybe he is acting out because he wants attention? As for training try Petsmart they have great training classes that can help you and help you 2 bond as well. Good luck