[C#] Need some help setting goals

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Hirnwirbel: I want to make it from the ground up - so it would be my own

Okay... don't really see the point as there are more than enough 3D engines out there - also those that only provide you with the basics of displaying 3D objects and let you code everything else from scratch - but if that's what you want then I'd say you have your goal, right?

Like I said, I don't know much about programming, but I believe that some research into OpenGL might be what you need. So go ahead then - to the Googlemachine with you!