I would say setup a warehouse, tie in the online system to your computerized stock system so you can go from ordering stuff online to shipping out of your warehouse. You pay local kids $7.00 an hour to take the requests off the web site, grab the product, pack it, and ship it out. Real easy job. The problem is that you need a decent amount of space and a lot of capital to start out with to purchase all those products and the space that you'll put it in. This makes you a middle man.
Can you tell I worked pickup at Toys-R-Us for a summer? That's all I did for a summer. Get a request for something, grab it, throw it in a car. Go back, do it again. Easy job, crappy pay though.