For domain owners and users, you will usually get a package deal in have a mail domain nameserver to go with the domain you use. This allows you to assign and create your preferred emails since you own that domain. But one thing you will notice is that you are tasked with maintaining it as well.
This includes tasks as assigning storage quota, email types and handling and whether you want them to be stored on the server or downloaded once accessed. Of the three, the storage quota is important. Remember that if that email is not checked or retrieved regularly, they will pile up, occupying a larger space and eventually become a problem when you start receiving new mail.