3 Month Old Puppy Questions… Potty Training, Treats, Feeding, Etc…?

I’m having a bit of difficulty getting her to use the training pads, she always pees somewhere else. She is pretty good with going outdoors, but I have to be on top of her taking her out every so often, and she’ll pee on the floor between trips out. I wake up to a few poops every morning, off the pad of course. Is there anything I can do about this? How long on average does it take for the training to sink in? And when will I be able to reward her with treats for going in the appropriate place, and what brands are healthier. One last question, how often should I be feeding her, and how much.
Sorry for the long entry and many questions. I just got a 3 month old havanese two days ago, and I want to the best for her in every way.