How will I know when my prepaid order is processed and on its way each month after I order it for the first time?

Your prepaid order will still process as a normal order would and you will receive an order notification email that it has been processed however it will not be a charged order due to the order already being prepaid. This will usually process between the beginning of every month up to the 10th after your initial order which is the standard subscription order processing period each month.