Corny are good start I personally use them but a keg is only one piece of the puzzle, you will need hoses for gas and serving, ball lock fittings, a tap, picnic tap can function, gas regulator and bottle plus somewhere to keep it cold like an old 2nd hand fridge. also you might need something like a auto syphon to fill it from the fermenter or valves connectors and more hose if you want to pressure transfer.
There are starter kits I think from most homebrew online stores but this wont cover everything