I am just installing CUPS , the print server right now, so I can't help too much, but the manual is here: http://www.cups.org/sum.html
The ethernet card should be pretty easy though. I don't use your knoppix (i've never heard of it), but I bet there's a graphical configuration tool for the network stuff (are you using a window manager like KDE or GNOME?).
Now, i don't mean to scare you here BUT: the driver for your card MIGHT not be compiled into the kernel.... just get back to us if you can't get it to work with the graphical network config stuff.