WooCommerce new order email notification

Question

In Woocommerce, I have created a custom cart with different calculated tax and new total.

How can I send the email with this new data?
In what file of Woocommerce?

<?php 
global $woocommerce;
$items = $woocommerce->cart->get_cart();
foreach($items as $item => $values) { 
    $product =wc_get_product( $values['data']->get_id()); 
    echo "<b>".$product->get_title().'</b><br> Quantità: '.$values['quantity'].'<br>'; 
    $price = get_post_meta($values['product_id'] , '_price', true);
    echo "Prezzo: ".$price."<br>";
    $carrello = $values['quantity'] * $price;
    echo "Totale: ".$carrello."<br>";

   // Below the new data with tax and discount calculation:

    $percent = ($tax_amount / $without_tax) * 100;
    if ($percent == "10") 
        $tax_rate = 10; 
    else $tax_rate= 4;
        $with_tax = $scontato; 

    $totaleforsebene = ($scontato * $percent)/100; 
    $totalForSebeneArray[$values['data']->get_id()] = $totaleforsebene; // add the value by the item ID
    $totaleforsebene = number_format($totaleforsebene, 2, '.', '')." €"; 
}
?>
<th>Iva<br />Totale chiusura</th>
<td>
<?php 
$totaleiva_1 = 0;
$items = $woocommerce->cart->get_cart();
foreach($items as $item ) {
    $totaleiva_1 += $totalForSebeneArray[$item ['data']->get_id()];
}
$totaleiva_1 = number_format($totaleiva_1, 2, '.', '');
echo "&euro;"; echo $totaleiva_1;
echo "<br>";
$totalefinitocarrello = $totaleiva_1 + $total;
echo "&euro;"; echo $totalefinitocarrello;
?></td></tr>
<?php endif; ?>