Getting data from Amazon

$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 . ‘<br />’;

The zend framework is as above but what URL other info do i need to call Amazon?
Also i am intending to use data in a wordpress plugin so how do i save data in a table?