How to get all the categories and items of amazon product advertising API

I want to create a product comparison website that will show the products from different websites and will compare them. For this, I have Amazon Product advertising API (AWSAccessKeyId, Associate Tag and Secret Access Key). I am new to this API. How can I get all the categories of products provided by amazon.com, so that I can pick each and every item from this site. Currently I am using this url:
http://ift.tt/1HGH2Hk &BrowseNodeId=1&Operation=BrowseNodeLookup&ResponseGroup=BrowseNodeInfo&Service=AWSECommerceService&Timestamp=my_timestamp&Version=2011-08-01&Signature=my_sign