Please let me know how I can Download OpenGl and Coin3d.
Coin3d from the website. www.coin3d.org, I think, or google will tell you.
OpenGL, hmmm, not quite sure what you mean, it’s probably already there? I’d suggest you start with the OpenGL faq, or some introductory tutorial, which can be found in this site (opengl.org)
Welcome to the real world