Hi! I have 3 boys and a stepson, and I potty trained all of them....it was actually much easier with the younger ones because they wanted to be big boys too. Mine started right when they turned two, and my youngest actually started when he was 15 months old on his own, so don't think your youngest is too young, you never know!
If this is an option for you, I started mine with just p.p.ing outside. If we saw an ant on the ground or something like that, I would tell him to pee on that old ant! They knew that ants will bite and they hurt, so it was fun to pee on them. Of course, that wasn't the only place I let them go, we did a lot inside too, and the lady who posted about the cheerios in the potty made me laugh - that's a really good idea!!!!!
I've rarely heard of any boys not training until they were 3 or 3 1/2. And like others here, please don't use pullups...they are nothing but a more expensive diaper and simply don't work. Get the regular cloth training pants with the thick middle. Yes you will have some nasty clean up duty. But you will save loads of money, and they actually work. We had a training potty that we put in the living room and they could sit on it while watching a favorite program; they actually did pee in it some, but did better on the regular toilet. And, yes, with boys, definitely face them backwards!!!!! Another mom had posted it, about how it helps them understand how to aim, etc....It also saves your legs from getting wet if you stand in front of them to hold them on the seat! I learned the hard way that little boys are really good at aiming between the seat and the bowl!
Let them wear a diaper at night and naptimes at first, but if they don't wet it for a couple of times in a row, a couple of nights in a row, then you know they are ready to wear underwear.
Training for pooping...for me, it seemed the boys were much more aware of it than pee and it didn't take long before they knew when they had to do that. I could catch them before they went because they almost always passed some really smelly gas.
I'm not really a big advocate of giving candy or special drinks myself, simply because it could work in reverse....they will stop using the potty because they won't get any sweets. I always just made much over them using the potty and told them how big they were and gave them a great big hug. We always clapped our hands and cheered.