It's simple. First of all choose first early potatoes any variety will do, these are great for containers and will be ready to harvest in 8 - 10 weeks.
Choose any large container - I use large old compost bag...free. And roll the bag down, to about a foot high off ground and punch some holes into it.
Fill it with compost, put 3 potatoes in and cover with few good handfuls of compost - roll up bag slightly if need be.
It's a bit too early just yet, I'd wait until at least beginning to mid April depending on where you live. But in the meantime, get chitting although not important, it just gives them a head start.
And keep the bag moist as they are prone to drying out quicker than in the ground. Remember, as they grow, unroll the bag and top up with compost. As potatoes grow upwards, not down.