If you want to get at large number of affiliates or partners, send application form right away.
Cost per Click can easily be explained as the amount that you will have to pay every time someone clicks through to your site from the site of a person signed up to your pay per click marketing scheme. Once someone clicks on a link on a site and are taken through to another site, they are considered to have taken part in the scheme and the person owning the site they clicked through from, will be entitled to payment. They have brought someone to your site and given you the chance of a sale, so will need to be paid.