Unless you have access to the source code to a game, a port is not possible.
To learn to program and make your own homebrew (perhaps a game similar to the one you wish to see ported), there are several ways. One would be to register for college courses in programming. Another would be to buy a book and teach yourself C and/or C++, and when you are familiar enough with the language, start trying to write simple programs for the Dreamcast in C/C++ using the KallistiOS API. Another way to go about it would be to learn from internet tutorials. If you've programmed before in another language, you may find some success with the tutorials at http://cone3d.gamedev.net which should help you become familiar with C++ and the SDL API, which is useful on the Dreamcast.
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