YOU have to explore the various methods and decide what will work for you and your son, each child is different and there's no one right or easiest way.
Some children like all the fuss and hoopla over their peeing and pooping, some are embarrassed that anyone pays attention.
Some will try for the sake of being a "big" boy or girl and some will want to stay a little boy or girl, and tell you so.
Some like stickers, or candy as rewards for trying or succeeding, some could care less.
Some will love the thought of wearing big boy or big girl underwear, some don't see the need.
Some will fuss, even cry if they're wet or poopie and beg to be changed, some will sit in it as long as you let them and fuss when you go to change them.
Some will train completely for day & night in 4 days, (as my grandson did) and some will take over a year.
Some will love their potty chair, others will want to sit on the BIG potty (toilet.)
Some will love to flush, some will be scared of the flush.
And, if you're a go-with-the-flow type person, and they like structure or vice versa...see what I mean? There's no one right way to do it ; )
Start talking to other moms to see what worked for them, research the different methods, observe your son to discover his personality traits that can help you come up with a plan that's best for him and the way he learns. Does he follow by example? Is he stubborn? Does he fuss when needing to be changed? Is he organized?
Set the potty where he can see it, let him sit on it if and when he wants, with his clothes on at first. Start telling him that's where he's going to be peeing and pooping when he's bigger.
With my grandson they had the potty seat out for about 8 months before they actually began to train. When he was 2 years, 8 months Mom let him go without a diaper during the day and took him and put him on the potty seat on the toilet (she chose this as she didn't want to train him twice) at various times to try. He had some peeing accidents and a pooping one (she caught him running it in his hands to the toilet) but by the end of the second day he got it. Dad showed him how to pee standing up. She put him in a diaper that night and he stayed dry that night and the next so the 4th night she stopped using diapers totally and he was in regular underwear that night and from then on, she never used pull-ups since she thinks they're just expensive diapers. So he was trained in 4 days and never looked back. No rewards other than Mom and Dad clapping and praising him. He's a guy who aims to please.
My guy is 26 months, we have the potty chair sitting where he can see it, he's sat on it and danced around it but hasn't used it to pee or poop in yet. He IS into rewards so I have 2 sticker books and stickers just waiting. He knows what pee and poop are, but hasn't yet told me when he has to go, and he's not particularly in a hurry to get changed when he's wet or pooped. I think he's still at least a month or so away from being ready.
Whatever method you choose take your cues from your son, when you see signs he's ready encourage him, if he balks don't force him. Don't try to train him when there's other stuff like a new baby arriving, a move to a new home, or moving from his crib to a bed. Know that he will do it his way, in his timing.
Here's some links to info I've found helpful:
http://kidshealth.org/parent/emotions/behavior/toilet_tea...
Toilet Teaching Your Child
http://familydoctor.org/online/famdocen/home/children/par...\
Toilet Training Your Child
http://www.keepkidshealthy.com/parenting_tips/potty_train...
Potty Training
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