Since there is an almost endless possibility of things not working the way that they should, we will point you in every direction possible in order to help you solve your problem.
If you haven't gotten into Linux yet, you can check out Debian's Installation Guide.
If you are in Linux and don't know how to use a certain command,
you can type "man <commandname>". For example, if you want to more
about the command "ls", type "man ls" (without the quotes).
You can look in the /usr/doc directory. This directory contains more directories which contain documentation for nearly every program you have installed.
You can also look in the /usr/doc/HOWTO/ and /usr/doc/HOWTO/mini/ (or /usr/share/doc/HOWTO/) directories for most of your common questions.
A very good source of information is the Linux Documentation Project webpage.
You can search our page for information you may have missed.
If you are experienced in IRC (Internet Relay Chat), you can connect to the server irc.debian.org (or irc.openprojects.net, same thing) and go to the channels #linpeople, #debian, or #linuxhelp. The "people" there are nice and usually willing to help you solve your problems. A good IRC client for Windows is mIRC and you can install epic4 or xchat (requires X) for Linux.