Is there a Game-modding guide?

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Hi, I really want to try my hand at modding. I kinda want to add all the modern day European Micro-states to Medieval: Total War II... Just for a laugh :) All hail the mighty and powerful Kingdom of... Liechtenstein!!!
So is there a good Interweb guide to help me on my way to modding? If so then can someone please give me a link.
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