So many webmasters overlook this critical component of a successful site. However, it is one that is easily corrected. A complete course in copywriting is outside the scope of this article, but to point you in the right direction, I would suggest that you start with "Tested Advertising Methods" by John Caples, followed by "Web Copy That Sells" by Maria Veloso.
First of all - The 30-Day Challenge. This is a completely free 30-day course we put together over at MonetizePros. The goal of it is to teach you all of the critical skills in internet marketing while getting you to your first dollars in the first month as well as giving you a long-term road map to building out the business to something more serious.
I, too, have always looked at ClickBank as a secondary and even tertiary monetization source. But it can be a great sources of revenue. I linked one of my articles to a related product on CB, and without really doing promotion or anything unusual, I get a few sales a week. Mind you, the keyword(s) for the post aren't that huge either. So, even though the traffic not huge on that post, it still manages to get some sales.
When promoting affiliate offers, just make sure you are fully aware of all the terms and conditions attached to your affiliate program. Some programs can be strict about how they allow you to promote their products. For example, some may limit you to banner ads and links only, while others will allow you to use paid advertising, but won't allow email marketing.