Lots of questions, I have not used V6, but am familiar with Knoppix.
Passwords, as I remember there are none on a HD install. For root, I think you can 'su' and press enter for the password. It is a live distro, and therefore is not secured.
Firewall, never seen one when I've run it, at least not by default.
Antivirus - you don't need one, unless you want to scrub a windoze partition. I think clamav is included for that purpose.
Graphics. This one is a little harder to answer, It would help if you posted the hardware you are using. I see it is a Toshiba lappy, what model? and post the results of 'lspci' ( without the quotes ).
That should list the card type you have.
Printer. Cups is included. Open a browser, in the url bar type http://localhost:631
This will connect you to cups. If it does not respond, there are menues at the bottom to start cups.
In cups you can add a printer. You need to find out what driver supports your printer. Find that at linixprinting.org. There is a data base of supported printers and the drivers there.
Hope this helps...