What sets you apart from all the other card making businesses out there? How will you stand out? If you take a look at the successful handmade card sellers on websites such as Etsy, you will see that very often they sell into a tightly defined niche. This is useful in a crowded market. If you are worried about competing in a very general market, take a look and see if there is a niche you can break into. This can be what makes you unique, and set you up as one of the only businesses catering to that segment.
There are also plenty of photo hosting sites you can use to store your image files online, including Google Photos, Dropbox, SmugMug and Photobucket. Most of these sites offer basic free storage for a small quantity of files, and they make it easy to label and organize your images as you see fit. Different sites have different features, but most offer premium paid services that may better suit your needs.
The presentation of the cards—the packaging—helps make a successful handmade card business. A card that is neatly presented in a cellophane envelope looks more professional and can command a higher price than one that is unpackaged. Presenting cards in some form of packaging stops cards from becoming dirty or dog-eared and it also gives the ideal opportunity for further marketing. A label on the back with your phone number or website address could help you solicit further orders. Remember to consider shipping and packaging when factoring the costs per unit in your pricing formula.