The best way to learn how to make glass is to open up a level that you know has the glass type you wish to replicate within your level...
Look at the config, even right-click the mover which the glass and show polys, this will reveal the texture used, then ALT right click the texture to make it default and then find its name.
I expect you would like it to break when shot or bumped.
I know if many ways to make glass, up to you which method you want, ie bot seethruable or...
Bastard'O