http://www.grafting-tool.com/magento/index.php/
I started by buying a few samples to sell on e-bay to see if there was a market. So I guess you could say I started making money right away. The problem with trying to replicate my business, is finding the right product to sell. I was lucky that I saw they had this item, and I figured that there would be a market online for it. Trying to find a new product to sell and establishing links with the manufacturer would take some time. You would also need to contend with issues of minimum order size.
I guess you could call it a partial success. Currently its bringing in about $300 per month. I want to increase my revenue, but it hard to know what to focus on. The other problem is it has somewhat of a high overhead - we need to spend time shipping products, etc.
For my new side projects, I'm thinking of doing something digital, that can be handled entirely online.
I have tried selling photos to a stock photo service. I spent many hours tagging photos, waiting for them to work through the approval process, etc. After many months of letting my photos sit, I have yet to sell one.
Next I am looking at writing some Smartphone apps. We will see how that goes ...