Hi S.-
Here is what I did for my son and it worked out really well:
1. I went to the library and picked out as many books and videos about using the toilet as I could find. For about 2 weeks we read these books and watched the videos and talked a lot about using the toilet. I kept him in diapers during this time, but when he went poop I would change his diaper as usual and then bring the dirty diaper over to the toilet and dump in the poop. My son enjoyed flushing it down the toilet and would ask all sorts of questions about where the poop would go. We would be silly and say, "Do you think your poop is finding grandpa's poop?" I know, sounds gross, huh? But my son got a kick out of it because he thinks his grandpa is SO neat! And I found that talking about his poop made him actually think about when he needed to go to the bathroom. So we'd also talk about how after he eats food it goes down into his belly and then become poop and goes out his butt. Sorry if that unappealing to talk about, but my son became really interested in why and what was happening when he went to the bathroom. Being sort-of up front about it (in a sometimes really silly way - "eww, what did you eat! what sticky poo-poos!") made him respond quite well to the whole toilet training process.
2. We went to the store to pick out his very own, new toilet seat/chair! I made this a REALLY big deal and told him he could pick out whichever seat/chair that he wanted. He ended up picking out 2 toilets (1 that was an actual chair for the floor and 1 that was put on our bathroom toilet). 2 seats worked out really well because he felt more comfortable on the small one that sat on the floor and then he worked his way up to the seat that was placed on the actual toilet seat in our bathroom. During our visit to the store I also let my son pick out 2 packs of his VERY OWN big boy underwear. I told he was so LUCKY because they don't make Thomas the Train underwear in mommy sizes but I sure wished that they did.
3. He used the toilet immediately upon returning home from the store and I made such a big deal out of it. I had been reading in different magazines/books not to do this (the over-excitedness) because they would always except it then, but I found that this just wasn't the case. So for the 1st week of toilet training I put him in underwear when we were at home. The first day he wore the underwear, he went pee right in them. So we took off the underwear and I said, "ewww, stinky! you're supposed to go in the toilet!" He agreed that it was indeed sticky and I had him sit on the toilet for a few minutes. He went pee and I made another HUGE deal out of it - dancing, clapping, saying "Hooray, Hooray! I'm so proud of you! You're such a big boy!", hugging him, and calling grandma and grandpa so he could tell them what he did. He had one more accident that day, but after that he wore underwear exclusively during the day at home (he was in daycare, so for about a week he wore a diaper during the day there then I sent him in underwear the following week and he did great there too).
4. I should also say that I stocked up on PEZ and peppermint patties and after EVERY successful bathroom break, I let him pick out one candy. Once again, I read in magazines/books to definitely not do this because then he would except candy everytime, but once again, this was certainly not the case. After 1 week of this routine, I let him pick out candy only after he went poop in the toilet. I would just say, "you had too much candy, when you go poop in the toilet then you can pick out another one." He seemed just fine with this because I was still giving him gobs of praise and asking him if he was proud of himself (which, he very much was). Within a month from the start of his toilet training he was out of diapers completely and not asking for candy anymore.
It seemed the key components of his potty training were: preparing him with books and movies, letting him pick out his VERY OWN toilet seat/chair, letting him pick out his very own underwear (I read once that a parent had said, "eww do you think spongebob likes getting peed all over" when there child went to the bathroom in their underwear - this approach worked for them so perhaps, you could try it as well??), major praise and saying things like, "boy I bet you're proud of yourself," and finally a bit of bribery (=candy. I hated to do it, but it was well worth it!).
It could just be that my son was ready to use the toilet, but perhaps some of this might work for you as well.
I wish you the best of luck and many diaper-free days to come!
Take care,
-R.