More resources:Journal Notes on a Deck Production Process How to Self-Publish Your Tarot or Oracle Deck.
Benebell Wen, creator of the Spirit Keeper's Tarot, has posted about her deck creation and production process multiple times, including in Journal Notes on a Deck Production Process, and offers a course in How to Self-Publish Your Tarot or Oracle Deck.Useful Resources for Deck Creators
Kimberly Tsan has a good collection of her thoughts and resources here.How to Self Publish Your Own Deck
The oldest resource I've found is Arnell Ando's site, which has been updated regularly since 1997.How to Create an Oracle Deck & Have it Printed
I haven't used MakePlayingCards but Capricorn Moon Goddess has a great tutorial about using them.The Oracle Creator
Published by Liminal 11, this is about the process of designing and printing a deck.
Other concepts that have influenced my oracle-making include:the Journey Deck the Alleyman's Tarot Bones, Shells and Curios Playing Tarot Solitaire
There are also tons of excellent YouTube videos about creating your own deck. Some are about making a deck by collage onto cards, so that only a single unique copy exists, and some are about the process of designing the art for a deck, while still others are about the process of printing or selling or kickstarting a deck. I recommend browsing YouTube if you're interested in seeing a lot of different takes on the deck creation process and what options you have for it.