In another post, I described how to market test your online business ideas in 6 easy steps. This is a pretty reliable method for anyone creating a website designed to sell AdWords or to promote affiliate products. But if you are planning to invest time and money in creating an information product of your own that you plan to sell, then you really should do additional testing. While you might think your proposed information product is exactly what the world needs, the world may think otherwise.
Do yourself a huge favor. Run all the tests I described in that earlier post, but also run an experiment with Google AdWords. An experiment, as described below, will give you very reliable data on whether anyone is actually ready to purchase your product or not. If people are ready to buy, then go and create the product. If people do not want to buy, then you probably want to look for something else.