You can setup an ebay store for free and sell products where you drop ship the products to the customers.
When drop shipping you take the orders for the products you sell, keep the profit and then pay for the product through the drop shipping company and then ship the product to your customer without you having to handle the product.
You can also sell T Shirts online and have the T shirt company print designs that you make on your computer.
You can make some good money selling and designing T shirts online but you do need to invest a little bit of money upfront to do so.