Step 1: Yarn and needles
Step 2: The tail end.
Knitting tip, When not increasing or decreasing, I always slip the first stitch at the beginning of the row, instead of knitting as this makes a much neater row end.
Step 3: Decrease
decrease one stitch at each end of the plain rows only, until 6 stitches remain on your needle. (Decrease by knitting two stitches together) Knit three rows in stockinette stitch without decreasing.
Step 4: On the increase
Increase one stitch at each end of every other row (the plain knitting rows only) until you have 24 stitches on your needle. Purl one row.
(Increase by knitting twice into the first and last stitches).
You can vary your colours and knit stripes if you wish.