I learned by doing a knit 3, knit 2, (knit 1 Purl 1 4 times)repete for each of 3 segments, then knit 2, bring yarn forward and turn
that was the first row (26 or 28 stitches I think)
then every (5th or) 6th row you either cable front, or cable back the middle (#2 of 3) segment
this was a free pattern i got from a store, and it taught me the basics of cabling
I have long lost the pattern, but its a reversible cabling stitch with a self hemming edge
my Sister recomends thie following pattern
http://knitty.com/ISSUEwinter03/PATTtoddle.html
hope that helps you