Recurring Donations are initiated on an Event Site. At the time of the transaction, confirmation of the pledge amount is provided via screen and/or email messaging and the recurring donation appears on receipts as a $0 line item.
The monthly payments (installments) are processed from the Account page and typically begin the day after the donation is registered (eg a credit card is provided).
A receipt is automatically emailed after each successful payment transaction, but you can also manually generate individual receipts as needed.
You'll want to set-up your receipt beforehand and you can customize the receipt for donations originating from different event sites.