Getting visitors to your sponsor's sales page is the one and only purpose of your affiliate website. Your site needs to be interesting and informative enough so that each visior will stay long enough to be pre sold on whatever you are marketing. This is how money making websites work.
A content site is one of the best money making websites. Your site should have a theme, such as weight loss. Now you can choose a few affiliate programs with products that fit your theme. I strongly advise that you find a niche in whatever market you plan to promote.
When choosing a domain name, it should contain one of your main key phrases. It should attract and interest visitors. Your best key phrase should also be used when deciding on your page titles.
In order to have a money making website, it needs to be filled with interesting and informative content that will leave visitors more inclined to click-through. This content should be engaging enough to capture your readers interest and at the same time be optimized for the search engine's. The better your articles, the more respect the surfers will have for you and the more likely they will be to consider your recommendations.
Never double sell your visitors. It is a costly mistake that many affiliates make and you will end up losing sales. Providing your visitors with good content that feature links to your sponsor's money making websites will warm your visitors up to the product or service without having to outright sell to them. Let your sponsors do the selling and you just get them the targeted traffic they need.