I'm a new yorkie mom too. My 2 babies are 3 months. We've taught them commands like sit, up, lay, and stay. Well stay hasn't been completely mastered yet

All training requires repetition and of course treats

Make sure they are only given treats when they are training, not just because you feel like spoiling them. The sooner they understand treats and praise are only for good behavior, tricks, pottying in the right place, etc. then they will learn faster and be eager to learn

Our babies are defenitely far from being fully potty trained, but they improve everyday day. We're doing pee pads as well as outdoor training. My babies are fine in the cold, it's more that I'm not! LOL. If they are going out there to potty make sure you use the potty word over and over so they know the command and know they arent just out there to play. It's good to always have a small treat on hand so they get excited to go potty

Now when I take them outside and tell them to go potty the get on there mission and return ASAP to get there praise and treat. Keep us updated on your progress. Oh and CONGRATS!