You can set-up your email notifications in your store's dashboard, click Manage Store from your Website Builder editor > System Settings > Mail. Here you can manage the following settings:
Order notifications are sent to customers after a successful order placement to acknowledge its receipt. This email will contain information about the order, including item purchased, shipping & billing information and the order status.
In the section Order Confirmation, click on the available tab 'Edit' and you will be able to make the necessary changes you require.
Ecwid to provide further information on the variables and HTML code that is used here (http://help.ecwid.com/customer/portal/articles/1777695-mail-notification-variables)
New Order Placed
Your notification of a new order can be found In the Admin Notification section that is found underneath the section where you can update the order confirmation email for your customers.
This email is sent to you when an order is placed and contains the information about the item that has been order, shipping and billing.
There are a number of different notification that you can enable in the mail section of your dashboard, these include: Low stick notifications, Successful registration, Order shipped, Order status changed.