Normally if you don’t have your own product, the Internet Consultant advise is go to do research & see what type of product or information people most looking for, then base on that to create a website to sell it.

This not thing wrong, because get demand get business.

But how about if the product you choice is not your favorite & not in your knowledge area, it may be very difficult for you keep continue to do the business.

May be you can say I just do an affiliate website, not need to answer customer about the product questions or other relate issue. If like that, this is not long term business. Customer just 1 time off, will not come back to you next time.

So try to find a product you interested on it also. From that you can create a relate blog & make interactive with the customers. Customer services still important, no matter online or offline.