V.M.
I got a book from our library that was really old like the 1960s and i think it was called Potty training in Three days. sorry i don't have time to google the title for you.
First i would get books on going potty, and DVD's about it. and read and watch them but i wouldn't say anything about "him" going. Also do you allow him to watch you or daddy go? sometimes that can be an incentive to be like daddy.
Since you have already tried and it didn't work, you are going to really really have to have a plan and stick with it.
But i'll tell you a few things as an experience mommy and a teacher in preschool and toddler classrooms. VEry Very few kids are going to Tell you that they are ready. Why should they, when you think about it. Just like very very few kids are going to respond with a "Yes" when you ask them if they need to go potty, because that means they have to stop playing and that's no fun. It is far far better to get into a routine of having them try when they wake up, after morning snack, after lunch, after pm snack, after dinner and before bed. In your case, I would just start with having him come with you into the bathroom at all of those times, and either wash his face, brush his teeth, or watch you, just to get him in there, then you can start in a few weeks to actually have him sit on the potty.
For me, i put the potty in the kitchen on the linolium, so kids didn't need to run all the way upstairs to our one bathroom, and they still felt like they were with everyone not shut off in a room with nothing fun in it.
one of the big tips is to give him lots and lots and lots of liquids so he HAS to go, that way he can be successful and again you don't ask him, you just take him. For BM's or just getting him to sit still long enough to go, you could try having him blow soap bubbles, make a special bathroom book basket, or have special only on the potty toys to play with, like a hand mirror.
And in this case, yes, i think i would go cold turkey, since you already tried once. I think our culture doesn't prepare us that potty training is a process, There will be accidents' It's your job as mom to make sure he learns from them, Have lots of spare outfits on hand, and get some carpet cleaner (for you to use after he has attempted to clean it up himself with a soapy rag), The three day method is great, it is very intense and specific, behavior reward, but to be honest it will be a full month before there won't be semi regular accidents, and a full year beyond that with out occasional accident's. Don't stress over them, keep potty training postitive, just like learning to drink from a cup there will be spills, just have him help you clean them up.
I would also suggest, doing night time all at once too so there is no more confusion. wake him up drowsy and put him right on the potty, and then take him back to bed, maybe at 10 pm and 4 am or something like that depending on what his rhythm is, Do limit liquids past 5 pm. but give him lots and lots during the day.
Honestly, people have potty trained kids at 18 mo, but it's hard and it's a lot of work for the mom, Wouldn't it be great to just have them do it themselves when they are 5 sure. but personally i wouldn't wait. Good luck!