I've also been looking at packaging. I didn't want these art/note cards to bend. Some research later, i thought it was best to do the stiff cardboard sandwich method. I was thinking of how to make them when i remembered that Australia Post seems to have something like that in their product range. True enough, the Computer Disk and Photo Mailer seems like it'll do the job nicely. All i gotta do is wrap these cards in cello wrap to make them waterproof. And maybe add a ribbon. And a thank you card. And a business card.
Preparations, preparations...fortunately, Etsy has heaps of helpful information. The Seller's Handbook is very handy. I was overwhelmed when i first saw it. Everything from your shop's appearance to tips on describing your creations, to photography. Initially i was trying to follow all the tips. But now i've realised that is just not possible. I should just start listing a few items and then improve as i go on. Otherwise, my shop will never open LOL. Less perfectionism, so to say.