[PHP] Starting OOP

[Mike Smith]

I've been doing procedural coding for a few month's, but perceive the 
need for OOP for some of the projects I've done. I'm starting out and 
and would like some feedback, before I tread down the wrong path. The 
books I'm looking at Professional PHP (Wrox), and Visual QuickStart PHP 
have examples, but I seem to need something more concrete so I've 
started a skeleton to rewrite a Purchase Order application. Here is the 
layout:

<?php //pocode.php
class PurchaseOrder
{
//Variables
var $ponum; //This will be a $_SESSION variable if that matters
var $item;
function AddItem($ponum,$item){
...INSERT SQL CODE
}
function DeleteItem($ponum,$item){
...DELETE SQL CODE
}
function UpdateItem($ponum,$item){
...UPDATE SQL CODE
}
function ListItems($ponum){
...SELECT SQL CODE, RETURN RESULTS (ie. 
while($row=mssql_fetch_array($rst)){echo $row[0]....})
}

}
?>
I would then include that in my page,
and add items to a PO by doing something like
<?php
include('pocode.php');
$po = new PO();
If($_POST['submit']=='Add'){
//A HTML Button next to a text box to add a line item
$po->AddItem('12345','5063');
}
$po->ListItems('12345');

?>

Do I have the basic concept right? This is like relearning to code. 
Perhaps I learned in a bad way if that's the case. Any especially good 
tutorials or books to recommend?

Thanks

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