A landing page is just a page on your blog that you don’t post in the regular blog section. In this case, however, it might be a really big piece of long form content either about the affiliate product or, better yet, one that just mentions the product as a small but integral part of the whole article. For example, your affiliate product might be a great yoga mat and your article might be a complete beginner’s guide to yoga.
Fortunately, there are many resources available to help. In addition to the BlogHer events and site, some of my personal favorites for learning tips on writing compelling content, marketing and monetizing are Fizzle.com, MichaelHyatt.com and Problogger.net. All three provide lots of free advice (and more in-depth training and support is available for a fee).