Don't be afraid to use the online auctions and other sources to market your products either, you can laugh at ebay all you want but you'd be surpised at the number of major corporations using eBay right now. Sears and Olympus are the top two that come to mind. There are other companies using eBay selling through third parties as well. I'd avoid Yahoo though, my experience there is that you'll end up spending a lot of time and money for very little result. Ebay has been very good for me though.
Get business liabilty insurance too, I carry it primarily for the stands I build, but it's nice to have it there for other things as well, especially since you can be sued for someone using your hammer to hit themselves in the head now days.