First you take several years in programming courses, then you get yourself familiar in the Doom engine for a few weeks, then you can start coding in your modifications.
I think Conic hit the nail on the head here. To sum it up, you need to learn how to program, and how to properly handle the source code, and what tools you need in order to compile it afterwords. There are plenty of guides on google if you're looking to start learning, but just be aware that there's a lot of work ahead of you.
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