You can use two circular needles or magic loop. Two circs require 4 needles the same size and two cables. Magic loop requires a 32 or longer cable and 2 needles the same size. Some people manage with a 24 inch cable for magic loop, but I think a longer cable is easier especially if you're learning the technique.
I myself prefer the 2 circular needle technique and I've bought lots of tips to accommodate that.
Both techniques can learned here in the KH videos
. You can also look at this page to see if you need more help.