Do you have your own email already? I'll presume so. So, go to the Easily site and logon, The go to the 'manage your domain names' (or something similar) page. In there will be an option for configuring the email. In essence, the simplest way of using your domain for email is to use it as a forwarding service, which just sends any emails it gets onto your personal address. So you just create the mailbox name (EG enquiries@????.co.uk) and set it to forward mails to you.
As for sending, you can do this by changing the 'from' or return address in Outlook.
Note all the above is a simple, low-volume approach. If you're expecting 1000s emails, you really need a more robust and flexible solution, as offered by Easily.