Start out with a few live CD's to try out on your
computer. It's a sure way to find out if your hardware is compatible with the distro.
If you find a distro you like enough to install to your hard drive, try to stick with it awhile before
trying out other distros. Study a little bit about your Linux file system.
Learn the Command Line Interface (CLI). Here is a link that I think will really help you to do that.
http://linuxcommand.org/
After doing the above, you may want to test out more distros to find the one that you can be satisfied with. Knowing how to get around in Linux
to start with makes it easier and a lot more fun.