Well, you'll probably want to go buy some books on game development to get you started. They'll help a lot more than anything we can provide.
However, I think (from my VERY limited experience) that you can't do much of anything on a game without the engine. However, while you're writing the engine, you have to know how to interact with the textures, the sounds, and the user input.
The rendering engine is pretty key, though. Sorry I couldn't be more helpful.
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