SFML doesn't do 3D rendering.
You can fake some of it with 2D and lots of math, but I can't really tell you how.
If you want to render in 3D you'll need to use OpenGL as
Aleph One is using.
My personal advice is to try with something
a lot smaller to begin with. Writing an engine is not at all trivial. It requires a lot of knowledge in niche programming areas as well as math and much more.