My puppy is 5 months old and we've trained him on the pee pads and to go outside. We began with the puppy pads and at first he didn't understand to go outside. After a couple of weeks (with lots of praise and positive reinforcement), he started going outside. He still does use the pee pads when inside (with the occasional misses). You really have to have your eye on him at all times when he's inside the house. Try to catch him before he goes or during the movement. Make a sharp noise followed by a "no" and direct him outside or onto the pee pads. If you're training him to go outside, take him outside every couple of hours (especially after he's eaten, woken up from a nap, playing, etc.). Repeat the steps for the puppy pads. Yorkies and other toy breeds seem harder to potty train. You might also want to consider crate training to prevent accidents.
As for the biting, it's something that all puppies go through. You can try sound aversion. Fill up a can with pennies and shake it when he bites. The noise will startle him and you praise the wanted behavior. Immediately redirect to a chew toy. My puppy loves Merrick's Flossies and Bully sticks to chew.
Chase is not perfectly housebroken yet either. Just keep it consistent and optimistic. Hope this helped somewhat
. Good luck!