If i select Recurring Payment for every month, will be created automatically a new invoice with a different number every months?
yes, that's correct.
The module will create a new order for each recurring payment order, the order will be copied from original one. So it works like re-orders with recurring payment.
For example, if you subscribe $50 per month for a service. then every month, new order and invoice will be generated automatically when the payment is processed successfully.