I've been working with Linux for... well, it's got to be a decade now, and I run my own domain and mail server at home.
I agree with Sherob that Suse is a good distro - I've user that one longer than any other. Right now I'm using SME server for domain and mail, but I don't have a workstation distro loaded on anything at the moment.
Personally I like Mint best; that'lll be the desktop distro I load when I next have work to do.
If you're going to Dual Boot (I assume with Windows), the Windows must be installed first.
Do you have any particular goal, or is it just for fun?