I agree with the others, praise is key.
Keep your puppy contained to a small area where you can supervise and where the pee pad is readily available. Using an xpen makes it really easy to hit the target. Bring your puppy to the pad and acquaint him with key words like potty, pee, or poop, whatever you like. Tell him potty here and tap the pad. Don't worry if he doesn't go on command. When he does go on the pad, throw a party! Praise him and show him you are happy, and give him a little treat. Usually pups learn very quickly to repeat the good potty to please you and earn a little treat (I use a single piece of kibble).
Keep in mind that your Yorkie will need to potty more than 3 times a day all of his life. As a pup, he will need lots of potty breaks because his bladder is tiny and still developing. Many people recommend when training to make pottying available hourly. Overnight, Yorkies generally can go much longer without a break.
I use disposable pads that are infused with an attractant scent. Sometimes dogs will respond better to one brand over another, so you may have to do some experimenting.
Don't focus on scolding for accidents. If you catch him in the act, you can say "uh uh uh" or "uh oh" and bring him to the pad and tell him again to potty there. Then clean up accident sites with an enzyme cleaner to remove the scent that may attract him to return to the spot.
Good luck and congratulations on your new pup. Wishing you and Elvis lots of happiness.
