Here's a link with lots of free patterns and tutorials.
If you need help send me a PM.
I sew custom made clothing and do alterations I'm sure I could answer any questions you may have.

http://www.allfreesewing.com/?task=s...gathered+skirt

Good luck. I haven't made clothes for many years. Patterns are easier since you know the basics of measuring and sewing.
If you follow the pattern you shouldn't have any problems.