I am self-published on Craftsy and Etsy. I like to use my patterns in a class (or 5) before I publish them, so I can work out any kinks. Then I create a pdf of the pattern. Craftsy and Etsy have fill-in-the-blank templates, where you add pictures, a description, you set your own price, etc.. You need to create a PayPal account, and PayPal takes a very small fee. PayPal gives you a Mastercard business debit card to use. Etsy has another payment method that makes a direct deposit to your bank account.
Craftsy is all pdf downloads, but you can put paper patterns on Etsy. Pdf downloads is a great way to go. However, if you do sell paper patterns, PayPal and Etsy both have discounted prices for shipping through them, by USPS.
There's a Yahoo Group for quilt pattern testers. You can join and ask for testers there.