Well, we used the pads at first and then outside. Chuhga is very good and Waya is too except now that he is a macho dad, he will try mark inside. We have our oldest daughter's older (13 years) chihuahua and we have to watch her all the time. She was never taught to tell when she needed to go outside, but if we are in the carpeted living room (where she stays mostly) now she will go look at the door when she needs to go outside. If we aren't in there, then whoo hoo it's potty time.
We live in the country and have two fenced in yards. The big outside dogs have a huge yard at the side of the house with their own insulated house that has a heat lamp for them with a porch that is enclosed in winter (LOL it looks like a storage barn - that big) and we made another fenced in yard as OUR back yard. This is the one that the yorkies go out in. They love the outside. Waya is a terror on the cats. He will chase them if they run. They usually don't run and he jumps all over them to get them to "GO". He thinks he is a big dog.
You just have to be very vigilant when they are little. As soon as they get up and after eating or napping, out or on the pad. I never was successful with crating. I am sure that everyone else on here can give you better ideas than I have. When we built our new addition here, we installed an electronic door for my old dog (16 years), Chewy. He never got to use it as we had to put him to sleep over a year ago. It is in the front of the house and doesn't connect to the fenced in yard so the yorkies can't use it although if we can scarf up the money we may add to the yard to bring it around to the front. We are still leery of a hawk or owl swooping down on them so I keep an eye out when we're not out with them. If you have a fenced in yard and can put a doggie door in, that is the way I would go, but until they get a brain and can use it, you have to remind them where to go.