I grew some last year for the first time - Styrian Goldings and Cascade. Like you, I initially planted them in pots but the roots were soon coming out of the bottom, when this happens get them in the ground. Once they get going they'll grow like mad, so think ahead regarding training them - by mid-summer you'll be virtually watching them grow.
Even though it was my first year, I had a usable quantity of hops off both, although the Goldings produced much more: juts managed 1 brews from the Cascade but had several from the Goldings. Need to keep an eye on them for harvesting, there's a short window when they're at their best. I dried mine on baking trays in the airing cupboard then bagged them up.