How should I get started

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I like doing programming, specially I like doing programming on top of already made games and working on "server plugins". Since lately I started to play metin2 again I thought why not play a bit with the server part too. I am used to learn to program for a server game by looking at some docs or (video)tutorials. As the metin2 code is not made to be opensource and what we have on the internet isn't documented. So does anyone have links to some tutorials on how to learn to do metin2 stuff? And also a tutorial on where and how to get the server files(and be able to edit them as I like and add new features if I want)? Also a link to a client? If someone can give me some links to some docs or tutorials or anything about how to code something for the server and/or client I would like to have them.