affiliate program  

It does not involve advertising through ads on whatever ad-site whether paid or free. You must set up a site or blog about the product. You give information about it and make people enthusiastic. Then you link a few times to the sales page through your own personal link which you received. In order to get traffic you need to know SEO, search engine optimization. If you don't know it there is no chance you're going to convert the spend time and resources into cash.

Hi Desp, The best way to make money in click bank products is PPC, pay per click marketing, you can post thousands of ads on free websites but it really will not get a good response, if you are lucky you may sell a product in 1,000 to 3,000 clicks, so basically chances are very bad with free ads, ppc is investment of small money but you get the returns also, I have succeed with ppc only, my free ads are just hopeless, my free ads ratio was 1/4203 so I prefer ppc only, makes more sense to me. Good Luck, God Bless

To sell clickbank products you must have a site or a blog and bring traffic and write quality content are the most difficult part.
You must think about a niche: what are the articles you will write are about? Weight loss? Make money online? Pets? Try to search the niches which are the more popular today.
Then, write good quality unique content! Don't steal articles from others sites, write your own articles or hire a writer for your site/blog.
Learn SEO basics and build backlinks, ect, ect...
I suggest you to learn all that by visiting some blogs about SEO, find them on Google, there are a tons of them and good luck! ^^

Agree, the best bet for being rewarded for your time is SEO and article marketing. If you post ads they can get deleted and you have to start over. I did safelist marketing for awhile and it worked for me.