Are you leaning toward any specific distribution? Some distros have mailing lists and forums with really nice communities. I have first hand experience with Gentoo and Ubuntu forums, and they are both very friendly and informative.
I would stay away from the Slackware community at all costs. It's a great distro, but filled with egomaniacs who hate new people who ask questions, especially if the answer could be found "on the 10th page of an obscure boolean google search".
I learned most of what I know about Unix/Linux style systems from using RedHat, Debian, and FreeBSD. I personally prefer FreeBSD, but these two linux distros are good places to start because of the heavy documentation and support from user communities.