checkboxes value clicked or not save to sql

I have a table made up of time slots, when the user clicks maybe one or two and presses submit, i would like the date selected and the time slots chosen to be saved in to my sql.

I am working on the query but a little stuck in regards to the query, i have done the following:

<?php
$username = "root";
$password = "";
$hostname = "localhost";


 $dbhandle = mysql_connect($hostname, $username, $password) or die ("no         
 connection to database");


if(isset($_POST['Submit'])){

$start = mysql_real_escape_string($_POST['start']);
$end = mysql_real_escape_string($_POST['end']);
$booked = mysql_real_escape_string($_POST['booked']);

$selected = mysql_select_db("booking", $dbhandle);

?>

i have set the table as follows

 <input data-val='08:30 - 08:45' class='fields' type='checkbox'   
 name="booked[]" />