Original BASIC is basically (pardon the pun) obsolete. If you want to learn a BASIC-like language that has practical applications in the real world, then you might want to try
VB.NET. You can download the IDE for it
here. (Make sure to pick the Visual Basic 2005 Express Edition.)
As for learning resources, the
MSDN is your best friend. The IDE also comes with a competent collection of help pages. For tutorials and such, this cool site called
Google is really great for finding those. Books and software can be found at, well, book and software stores, respectively, or online.