Indeed, the command that I suggested is supposed to download lots of packages that are connected by a complicated network of dependencies and recommendations. Here's some useful reading:
http://www.debian.org/doc/manuals/ap.../index.en.html
In short, you need to configure your /etc/apt/sources.list before you can successfully use apt-get (or aptitude).
You can add your Debian installation CDs to sources.list by using (as root user) the "apt-cdrom add" command. You need to repeat the command to add the second CD, then repeat it again to add the third CD, and so on. After this you can use the "apt-get" command (or aptitude) to install packages from your Debian CDs. Aptitude is a useful frontend to apt-get -- you can use aptitude to browse available packages and also to install/uninstall packages.
If your Debian box has a working network connection, you can point sources.list to your nearest Debian package repository by using (as root user) the "apt-setup" command. After this you can download and install packages and security updates via network using the "apt-get" command (or aptitude). The APT HOWTO will tell you more. You really should read it as soon as possible. Here's some more useful reading for a Debian newbie (you don't have to read everything -- just browse them when you've got some idle time and read what appears to be interesting):
http://www.debian.org/doc/FAQ/
http://www.debian.org/doc/manuals/re...erence.en.html