From my mum, hold him on the potty from about three months so he gets used to it.
I know that mn mums don't believe that you can potty train a child before 3, but I used to live in Central Asia, where they don't use nappies, and all kids use a potty by 12 months. I was pitied because mine were running round in those bulky uncomfortable nappies at 18 months.
It isn't the same as we would describe potty training, what they do is after feed they hold the baby over the ground/potty and wait for them to wee (which most babies do within about 15 minutes of a feed), they make a hiss/whistle noise while the baby wees. In a surprisingly short time the baby associates the noise with weeing, so if you hold the baby over the potty and make the noise, they will wee. If you do that regularly enough, then the baby does all wees in the potty.
All my friends babies were trained by 12 months, and by then they would also begin to grab themselves when they needed a wee, and tuned in mum stuck them on the potty.
It isn't the same as we know it, ie a child KNOWS when they need to wee and choses to go to the potty, and yes, there are a lot of accidents, but I do get irritated at the mocking of this, it is real in many cultures and it does work.
I chose not to do it, but 1 of mine self trained at 18 months, another at 2 and only one was according to UK timetable.