3D Rotation

I’m working on a 3d Scene, Now becoming a 3d Enviroment scene. I am working on key input.
I have succesfully implemented movement on the means of the Z, and X axis.


But now I want to implement a means of rotating. Rotation on the “Y” Axis.
To set the appearance of “Turning” in a direction. Well, I tried


where the int “Z” is Increased/Decreased by 0.3f upon the single touch of a button.

Well, it worked kind of. The Rotation works. But the Forward,left,right,reverse keys get mixed up. Along with Rendered objects, (walls and a cylinder to be exact) I am unsure. But is this the correct approach? Or is it a simple mathamatcal and/or OpenGL function misuse error?