Well heck, I'm just going to go through all the older posts and share my knowledge.
I don't know anything about goldwave, but you need a multi track application. Cool Edit is my personal fave, but also look into Cubase, Nuendo, and Sonar.
And uhh, by not running a preamp between the processor and sound card, you're never going to get a professional sound. You should pick up a microphone (SM 57, Studio Projects condensor, Marshall MXL series...all under $100) and a pre amp (there are many for under $100. stay away from Behringer though!).