How do i make my own email provider?

You don't. You need to register a domain name. You can then use any name @your.domain. You would then need a mail server with a fixed internet IP address, preferably 3 of these in different geographic locations, and correct MX entries set in the registrar's dns. Alternatively you can use the domain registrar ro hosting company mail server and arrange for your users to use that. It will be a limited number of email addresses. Either way you will need to keep serious control on security, any user sending spam, or any opening allowing non users to access the server will get you blacklisted across the whole internet. You can also be held liable for any damages caused by your negligence in securing the server.
How do i make my own email provider?
Go to CHEAPAUSSIEWEBSITES.COM and follow the prompts.