Potty training boys: what made it easier for you?

I need all the tips I can get on potty training my three year old,

Do you dump Pull Ups completely, even at bed time. Or do you use them?

Would it be easier to use a potty chair made for toddlers or just the regular toilet?

When did you start taking him to town in his big boy undies?

How did you get them to understand the importance of telling you when they needed to go.

Also he goes to his Dads for a few hours every other weekend and I was wondering how I could go about that. Sadly he doesn’t take this stuff as seriously as I do so I’m worried it will set him back if we don’t keep it up on both sides and not just when he’s with me.