My advice is to Google on "Linux distributions" and go from there. You'll quickly discover that most of the popular distributions (RedHat, SuSE, Mandriva, Ubuntu, etc.) are based on the Debian GNU distribution.
For the value of the experience, I would recommend you start with Debian and go from there. Unlike the Windows world, most of us have tried a half dozen Linux distributions and learned something from each and every one of them!!
For a final production distribution, I would recommend SuSE. There are actually 2 versions of SuSE--the Novell SuSE Linux 10.0 and OpenSuSE Linux 10.0. The Novell version has been customized to be a little more user-friendly and it includes software with licenses other than the GNU GPL license. OpenSuSE, on the otherhand, sticks strictly to "open source" software!
Be patient and don't expect to achieve all your goals overnight unless you're a friggen genius at speed reading and learning. The reality is that you have a lot of homework to do to go from knowing almost nothing about Linux to running your own website.
Although you can find a ton of reference info on Linux online, 2 books worth investing in are: Running Linux - O'Reilly Press, and The Linux Cookbook (Tips and Techniques for Everyday Use), 2nd Ed., Michael Stutz, No Starch Press. Both can be had from Barnes & Noble online at substantial savings.
You'll have fun learning and using Linux. I make my living off Windows, but for my own business and personal use, I run Linux and open source software (OpenOffice, The GIMP, and much more).
Regards,
John