To see a list of your orders in Seller Central, go to Orders > Manage Orders. This page gives you a list of all your Unshipped, Pending, Shipped, and Canceled orders.
The best source for order information is the Order Report. An order report is posted every 24 hours. You can manually generate an order report for a particular time frame.
If email order notification is enabled in your account settings, you will receive an email notice for each order when that order clears the Amazon Payments system.