Pretty much the same as the boonex market. Everything goes through paypal. You enter your paypal email address the My Market settings by going to Market->My Market->Settings. The My Market page is also where you would create a new product.
You may see a notice that this site may bill a monthly fee for vendors that receive more than 20 per month in sales, however that has been disable. So there are no fees from me. Just paypals normal fees.