I know start small, so I am asking how to make a 3d walking game with the right hand being seen by the camera view (like minecraft), not fps.
That's a relatively large definition of small.
If you know OpenGL, can you create a first-person camera that flies around a world with some cubes or a terrain map?
Can you draw an arbitrary static mesh? Can you animate a mesh?
Something as "simple" as a game where you walk around terrain and see a first-person view of a 3D arm is more complicated than you might think. Break it into pieces and learn how to do each piece individually, then worry about combining them into a simple game.