http://www.linux.org/lessons/beginner/index.html is a reasonable on-line tutorial. Another good idea would be to get a book on introductry Unix/Linux skills (university libraries usually have several of these; some public libraries do too).
I have added the link to http://wiki.debian.net/index.cgi?newbie I would like to stard linux-newbie list here or in another server :? Regards.