Well, the most important rule to follow is that you cannot violate any intellectual rights or copyrights of others who hold those rights. There are times when quoting published works is permitted and other times it is not. I am not an attorney, so I cannot review your site and tell you that you are legal, but any copyright attorney should be able to let you know whether you are within the law.
Otherwise, there are several other guidelines, most of which are not related to your question directly. They are fairly straightforward. Please check the
Amazon Associates Operating Agreement for more information.