Carol W Here is a link to the stretch and sew patterns.
https://www.gmidesign.com/stretch/patterns.htm]
https://www.gmidesign.com/stretch/patterns.htm[/url]
Also, look into the kwick sew patterns many of them are with the knits. The main pattern companies have stretch knit patterns as well.
I would suggest you look into a book about sewing with a serger. I have a few of them and it makes a difference when you know how to set up for different types of serging. The manual should tell you a few things about it, but a book has projects .