You don't always need a premade template. For instance, here's how easy it is to create a Pages template for a single-sided quad fold card. But you do need to consider the inner margins and how to design a nice inside to the card even though it needs to print upside down.
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I have been using Print Master app for making cards for years. I love this video. I have already made one card. Now my problem is printing on the envelope. I use the A2 invitation envelopes. The size is 4 ⅜" x 5 ¾". I like to print more than just text. Can I do this in Pages also. Thanks Gary.
Roger: Yes. If the envelope size doesn't already exist, you can create it. See https://macmost.com/custom-paper-sizes-in-mac-pages.html
Thanks Gary. The custom paper size works great for printing odd size envelopes.