I’m just starting at Clickbank, so I’m a total newbie, but if I want to follow this strategy can I do it promoting just one product, for example, Category>Health & Fitness —> X product. Then, should i start a blog or something like that where i can talk about things related to the product subject? if so, do i have to start making entries about this recurrently? or I can opt for just making an article with a free ebook in exchange to user’s e-mails and follow the process?

Let us assume that you are into gardening. So you do a search for gardening and the next moment what you’ll see is all the e-books that were written by authors on gardening. Below the description of the book you will be able to see how much money you earn by referring your visitors to that book. Now, the reason why ClickBank is so profitable and attractive to many affiliates is that its commissions are very high.