Is there a reason he has to potty train now?
He's not ready. Just wait.
Most boys, are not ready to potty train until 3 yrs. old.
though, some say don't give them a choice and just put them on the potty every hour, or upon waking and before nap/sleep.
And some say don't "ask" if they want to go, just do it.
It's up to you.
But, a kicking screaming toddler who does not want to sit on the potty, simply won't.
Or, if in daycare, some will do the training for you.
You can't really "make" them ready... but just acclimate him to it... it will be gradual. Just show him videos about it, or read him books.
But, unless they are ready, its just going to be a struggle and a conflict and he'll probably just hate it. So it's up to you. Just every so often, try. But don't force it.
There's a book called: "Diaper-Free Before 3" by Jill M. Lekovic, M.D. It's supposed to have good ratings. My friend told me about it.
But don't feel "pressured" or compare your boy to other kids, or other Mom's. That will only derail your son and your efforts.
Potty training is a VERY gradual thing... that takes time to master, completely. By the time they are COMPLETELY potty trained... it will not be overnight.
My Mother In Law... always "tells" my Hubby how she potty trained them and ALL her grand-kids by the time they were 1 years old, and "how come" my son (who is 26 months old), is not YET. Whatever! Well, she would just leave them naked (she has tile floors everywhere), and she every hour just put them on the potty, and if they messed up the floor it didn't matter. For her, it just took a couple of days. In her words.
I am of a different philosophy.
Some, take a weekend, and leave their kid naked, outside, and then spend ALL day doing this. With the goal that the kid will, in 1 weekend, be potty trained and that's it. And they take away all diapers, and "explain" to the child.
Many different opinions on this. See what is best for your son.
All the best,
Susan