Enable apt-get in your pull down menu.
Then open up your file manager as root.
Go to /etc/apt/
You will find a file called sources.list open it up
make sure each line you see on this list starts with a #
# "comments those lines out and linux ignores them like they are not there"
then add these to the file
deb
http://archive.debian.org/debian sarge main contrib non-free
deb
http://archive.debia...g/debian-non-US oldstable/non-US main contrib non-free
deb-src
http://archive.debia...g/debian-non-US oldstable/non-US main contrib non-free
deb
http://archive.debia...debian-security sarge/updates main contrib non-free
deb-src
http://archive.debia...debian-security sarge/updates main contrib non-free
Once your done exit out to a command prompt use this command
apt-get update
you are done.
But at this point I would get a package manager since you are a noob to do this use this command
apt-get install synaptic
if it does not put an icon for you open a terminal and use this command to start it
synaptic
With synaptic you get a gui interface that shows you what packages are available for install. And installing packages from this interface is pretty much point and click.