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This tutorial video shows you how to create product advertising api keys for Amazon affiliates / associates through Amazon Web Services (AWS). An associate is typically forced to create their own affiliate links, but the API system provides the ability to automatically retrieve product information and easily create affiliate links and advertisements.
Once you have created an api key using this "how to" video tutorial, you can then use your keys in a variety of software to create your Amazon ads.
If you use WordPress, you can use WP plugins that will do the hard work for you.
Take a look at some of my Amazon affiliate plugins for WordPress:
http://ryanstevensonplugins.com/category/my-plugins/