skylygal,
There is no way to automatically convert a non-WordPress site to one that does use WordPress. So, to get it running on WordPress you'll have to build it from scratch (although you can probably copy and paste some of the text).
As a result, if your ultimate goal is to setup a free blog with WordPress.com, and your current site does NOT use WordPress, there is no reason to first setup a WordPress site with Go Daddy. Since you'll be building it from scratch, you might as well just start at WordPress.com so you won't have to build it twice.