H.K.
I'm no expert but I am doing potty training with my second child (he's almost 2) and from my point of view you just gotta dive in if you want them to catch on and not go backwards. So we just started one day with the potty chair in the kitchen (on tile floor) and letting him go naked or with underwear from the waist down. I would set the timer for every 1/2 hour and take him (regardless if he had to or wanted to go, I just made him) and then gave him two M&M's or other little treat for pee and a bigger ammount or bigger reward for #2. I have increased the time since then and take him about every hour. We have been doing it two weeks and he now has kept his diaper dry at naptimes a few times and definitely knows when he's had an accident. He is still learning, so he still has accidents, so I have to be on top him, watching the clock. And the other thing is he still doesn't poop in the potty, we're still working on that. Don't know if it helps, but basically I would suggest to find some kind of reward that works for him, something he's going to want and miss if he doesn't get (no reward if you go poop/pee in your diaper/underwear). And stick with it strong and hard for a few days and if you don't see improvements and signs that he's catching on, maybe stop alltogether and try later. The worst thing you can do is do it half way and drag it out over months and months.