Debian Question

[Jefferson Kirkland]

This question is for those of you out there who are Debian users.  I have 
recently installed Debian and am starting to learn it's ways, but one major 
thing that I am lacking is Xwindows; it just wasn't installed.  I would 
love to get it and install it, but how do you do that with apt-get?  I 
tried doing 'apt-get install X11', but it returned nothing.  Maybe I am 
missing something here and someone could please nudge me in the right 
direction.
Also, if I have a package on the debian cd that I would like to install, do 
I have to add the cdrom as a target for apt-get, or can I tell apt-get on 
the command line to look in a specific directory on my cdrom?

Thank you for you patience.

Regards,

Jeff