Members of this board encouraged me to write a pattern for a quilt that I posted here. I did, and I have been successful selling the pattern on ebay and to a few quilt stores. I have a friend who sells patterns at quilt shows or craft fairs and from her web site, and another friend who frequently has her patterns published in QuiltMaker magazine. Other people sell their patterns on sites like Etsy, Craftsy, etc.
I found this book useful -
https://www.amazon.com/Publish-Patte...lish+a+pattern