Each page has a coinciding action (function) associated with it in the controller page. So if you access "/user/listing/" you need a function called 
<code>
function listing(){
} 
</code>
associated with it. The function in the controller can be used to generate data for the view to display. 

To make a collection of all the users in your database, write 

<code>
$this->users =& $this->Users->find('all');
</code>

To display this collection in the view (/user/listing.tpl)

<code>
{loop users}
       <?php  echo  $user->get("name"); ?>
{end}
</code>