Older website

I have a website that's a little over 3 years old. It was the first one i built, and about two weeks of pulling my hair out. The original intent of the site was simply to build value for the clients i contacted and bid offline.
As my company progresses, more of my leads are coming online, and i want to optimize the site.
I started really delving into IM a few months ago. Now as i learn more about how marketing online really works, i want to try to get this site ranked as i move along the learning curve.
It's a hardwood flooring authority site, so the competition is pretty fierce. There is a link to it in the sig page, the optimization pretty well sucks right now, and i'm kinda wondering if i should scrap it and build a new site or revamp the existing one.
I also have some pretty relevent urls, way better than the one it has now, and i'm wondering if I could move it to a better url, like hardwoodfloorskansas dot com and just forward the existing url to it. But if i do that, i lose all the indexed pages from the old one right?

Mods: If this is in the wrong section please move it.

I'd appreciate any advice from my fellow warriors. Thanks!!