Plenty of Linux forums around with a wealth of advice, such as
Code:
http://www.linuxquestions.org/
A link to (and a list of the most popular) distributions can be found at
Code:
http://distrowatch.com/
Depending on how much you want to learn depends on which distro is best in my opinion.
Ubuntu is probably the most widely supported for people new to the distro but it does a lot of the stuff for you. If your interested in simply using it, then it's probably one of the best out there.
On the other hand, if you want to learn all the under hood stuff, playing around with something like Gentoo (loads of documentation on the Gentoo site) where you can tailor every package to your liking and compile it to your exact PC spec, can teach you a lot more but can be a steep learning curve. Although Gentoo have easier options available now, when I first installed it (when PC's were much slower), I spent around a day waiting for the desktop to compile.
I love Linux, always been a Unix fan, lots of similarities. Only thing I hate with Linux are the anti MS fanboys.