An online business degree in e-commerce or e-business is one preparation for online retail or business of every kind.
So, if you are planning to start an online retail business or be a part of one, you can either wait for eBay's next eBay University tour, watch the video on this page or check out the online business degree offerings on pages like WorldWideLearn to find online e-commerce and e-business degrees.
Remember to seek an online business degree, bachelor degree in business, masters degree in business etc. at an online business school or university that is fully accredited not a "diploma mill" producing diplomas that may actually damage your reputation with potential employers.
Also scope out the online university or college of your choice seeking both online reviews and directories to determine whether the business courses they offer are right for you.