When an order is placed, you, as the artist, are responsibel for shipping the product. You can either print it yourself and ship it (you add a shipping charge to your site; you can create a shipping label from within etsy, with prices cheaper than you can get through USPS.com). Or you can get set up for someone else to print the image (you need to be approved by etsy). In this case you then order the print through FAA (or which ever pod you use), and get them to ship to your customer.
I print my own, and make more money than if I got faa to print them. I will, however, get FAA or somether site to print and ship canvasses for me (which I cannot produce), when I have some spare time.