If you want something really simple to use, I would suggest getting a Mac...
More seriously, a very good place to start, IMHO, is the "Slackware Essentials" book, that is actually available over the Internet, at http://www.slackware.com/book
This book covers a lot of features, and explains a lot of stuff in a simple-to-understand manner. It's not very large, and therefore, perfect if you want to get a quick idea of how Slackware works. Reading documentation is important when using Linux (any distro), because the system is quite complex.
Another, more general, book is the "Rute" book, which you can find at the following address:
Now, if you really don't understand a thing in the "Slackware Essentials", I would suggest going to Red Hat first, then to Slackware later, once you have a better "grasp" of Linux.
The idea behind Red Hat [and many others!] is to "hide" the complexity of Linux behind a layer of GUI tools, just like Microsoft tries to hide the complexity of Windows XP behind its own GUI tools.
These tools can be pretty good, but, if they are buggy, they can create more problems than they solve.
On the other hand, the idea behind Slackware is that it's better to leave the user complete control over the system and not try to hide Linux complexity. Therefore you are in charge, and not some GUI utility. This means that, if you blow it, you are responsible. But this also means you learn a lot more about the system in the process.
Slackware also aims to be as stable as possible, which means that you won't find the "latest and greatest", but only software that has been well tested. This is another, great reason to try Slackware.
Finally, this forum (and many others) are a great resource if you'd like to "pick the brains" of people who have more experience... Just remember to read a lot before you try to
That's about it. You took a great decision to leave MS behind and I wish you all the best with whatever Linux you decide to use!