Multidomain Postfix MTA Installation on Ubuntu 20.045

I am requesting to install and configure Postfix on Ubuntu 20.04 with following features. This installation will be done on our server together so that I can learn.
- Multi domain support
- SSL or TLS configuration
- DNS configurations
- Postfix admin GUI installation
- Virtual domains and user configuration
- Inbound and outbound emails to gmail and yahoo
- IMAP and POP3 server installation and configuration
- Multi server Postfix installation. Distribute mailbox's thru different servers