Best starting point is to download Alletun's handy 'Tome of Knowledge'
He has colelcted together pretty much all the useful nuggets of modding know-how into a very pretty and well presented set of pages. On top of that, he actually has done ALL the things in the Tome, so he is not just passing on the wisdom of others, but rather distilling out the things people need to understand to get the modding jobs done.
There was stuff in there that I didn't know too
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