Potty Training Fun

I don’t know why I said fun, maybe to get your attention because I need the help! I am about to begin this potty training “adventure” with my son, now 31 months. He was going pee-pee in he potty a couple times a day until he started preschool and then everything backfired and he refused to go on the potty, so I didn’t push it. But lately I feel that he might be ready again. He holds his pee if he is in public and doesn’t want to sit in a wet diaper. He wakes up at night and wants to go to the bathroom and I am recognizing that he is starting to pay attention to the “urges” when he needs to go to the bathroom. I have no idea where to begin or what to do. There are some many different opinions out there it is making my head spin. In the meantime, I think I’ll start by taking him to the store and letting him pick out “big boy” underwear and the toilet he wants to use. I am desperate, would love to hear what has worked for others. Please share. Until then, I desperately need to do some research.