I'm assuming that because you're posting in the web programming forum, you want to learn VBscript so you can produce ASP or ASP.net pages.
It's server side programming, pretty basic and quite easy to learn. Get good at a few basics including the if/then construct, strings and the request object and you'll be well on your way.
Head over to W3Schools
VBScript Tutorial for some online tutorials and try to find a copy of "Learning ASP" from Wrox Press.
If you need code examples, along with tutorials outlining the how and why behind each script, you can find them at
4GuysFromRolla.com
Google "ASP Scripts", "Free ASP scripts" and "Learning VBscript" for more info.
Good Luck.