xymalf on "Amazon API"

$amazon = new Zend_Service_Amazon('AMAZON_API_KEY', 'US', 'AMAZON_SECRET_KEY');
$results = $amazon->itemSearch(array(
    'SearchIndex'   => 'Books',
    'Keywords'      => 'php',
    'ResponseGroup' => 'Small,ItemAttributes,Images,SalesRank,Reviews,' .
                       'EditorialReview,Similarities,ListmaniaLists'
    ));
foreach ($results as $result) {
    echo $result->Title . '';

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The Amazon Zend Framework is as above but what URL do you have to call before the framework? Also how do you input all your form data [fields] into the script?