Summarize this article:

Once you've decided on a brand and compiled a team, make a small batch of cards. Aim to make around 50 to 100 and see how well they sell.  The quality of your greeting cards can help them sell, so use the proper paper. Use premium paper stocks, like 16-point gloss cover or 13-point matte cover. You can find the proper paper at a local print shop.  Greeting cards can be printed in a variety of sizes. For the most part, however, they're 3.5-inch by 5-inch, 4.25-inch by 6-inch, or 5-inch by 7-inch. You'll also need big enough envelops to sell alongside the cards.  Keep in mind you'll probably need a special printer to print cards. You might not want to buy a printer yourself, as they can be expensive, but you can pay to use the right printer at a local print shop.  Stock up on supplies in your local craft store. Glitter, glue, and other items for decoration can help your greeting cards stand out. At the moment, cards that look meticulously crafted and unique are in, so put some extra effort into your cards. Learn about different types of greeting cards.  Window cards are cards where the cover has sections removed so you can peak inside the card. It creates a window into a scene. These are fun, especially around the holidays. You can have Halloween, Christmas, or Thanksgiving themed window cards. Cards with scrapbook-like decorations are also in. These have a homemade feel to them that customers love. A scrapbook card is made with an assortment of decorations glued to nice paper. For example, for a birthday themed scrapbook card you could glue bits of wrapping paper, ribbon, and a stick of a birthday cake on the front of the card. Cut out the necessary letters of "Happy Birthday" from a local newspaper or a magazine. More elaborate decorations are also in at the moment. These include cards with pop ups inside, cards that can be folded into different shapes, and cards with slots to place money or gift cards. Use your imagination when creating your cards. Are your cards going to be sweet and sincere? Or funny and sarcastic? Decide what written content to include, if any. Many people enjoy having inspirational or amusing quotes inside cards. This could help your cards sell but keep in mind you need to be careful when selecting quotations, especially if you're looking online. It's not unusual for quotes to be misattributed on sites like Quote Garden and Brainy Quote. If you're not crafty but have a great idea for a card, consult your team. Ask someone with more experience working with their hands to help you with a product. You can also take course at local community centers that go over the basics of things like scrapbooking, decorating, and drawing. This could help you gain the skills needed to make stand out greeting cards.

Summary:
Get the necessary supplies. Decide on a card type. Decide on written content. Seek outside help if necessary.