You have kind of a big blocky rectangle skirt. Next open it up and change your sewing machine's tension so it will create the biggest stitches possible. Instead of sewing a waist band in like a normal skirt, you are just sewing a straight line around the two layers of fabric joining them together.
(You are sewing the raw edges, not the bubble hem)
This is where I didn't get pictures.. awesome.
We are going to create a ruffle. Don't do a back stitch when you start sewing around the skirt or after.
Make sure the skirt ruffles are evenly distributed and pretty loose.