Take a look at this http://www.cometosilver.com/socks/SockClass_Heel.htm
Basically what you're doing is taking the ONE needle that has the number of stitches you need for the heel and your spare needle and you're just working back and forth on that needle. Like you would if you were knitting with two plain straight needles. IGNORE ALL THE OTHERS for now. They are irrelevant. Work on that one needle to make the flap.
The "wrong" side will be the side that faces in to the middle of all your DPNs. The "right" side will be facing out.
Hope this helps some.