Hi ladies :)
I use weebly and have created several sites with it. One of course being
http://www.shaynamade.com/ I love Weebly!
I currently use ecwid.com for all the items listed on my site, but I have had experience with the integrated weebly cart as well.
First you will want to set up your method of payment - When you have your site in edit mode, you will want to click on the "settings" tab near the top of the screen. That will bring up a window with various settings ... click on "ecommerce settings." I think paypal is the easiest to set up, as you probably already have one through your Etsy shop. So choose Paypal and insert your email. Then press pay at the bottom.
Within the product block, you can only add one image. If you want to add others, just drag down more "picture" blocks beside or below the product block and insert your other images.
Here's a short article that explains how to charge shipping (
http://kb.weebly.com/paypal-shipping.html). This is one reason why I chose to use ecwid.com. It was easier to offer varied shipping as well as different options for your product. Another way around that is to include a shipping cost within the price of your product. Then tell the customers that shipping is included - or use the words free shipping. Side note: Ecwid is also free and they provide html codes that you can paste into one of the draggable "custom html" boxes on weebly.
Susan, since the Etsy Mini is directed straight to your etsy shop, the customers will still have to create an Etsy account. I know that can be frustrating.