Have you worked with OpenGL yet? I know that this is not the answer you want to hear, but I believe that the latest version of OpenGL has an extremely steep learning curve. I highly recommend learning OpenGL 1.x with "direct mode" (calls to glBegin, glEnd), then learning about vertex arrays and displayed lists, as well as vertex buffer objects and index buffer objects, and finally shaders.
NeHe has some great guides to get started with OpenGL 1.x, and after playing with it for a week or two, it's usually pretty easy to learn about VA, DL, and then VBO. Shaders are pretty tough and actually have their own language (GLSL). Once you understand all this, you can probably go to the latest OpenGL stuff a lot easier.
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