The easiest way to select a product or market is by using ClickBank.com.  Firstly you go to the ClickBank Marketplace.
If you have a market or product in mind try searching it but if not, try browsing the categories and subcategories.  When you get your list of results, click on “view pitch page” to [...]

Before I go into selecting the keywords for your campaign, you should understand that the more time you spend doing this the more time you will save in the long run.  This is the research phase and ultimately, arguably the most important phase of any campaign.
I will now go over the basics [...]