I want to setup multiple websites and multiple emails on single VPS with 1 IP

Hi,
Greetings,

I want to setup multiple websites
and multiple emails

on single VPS with 1 IP

I have contabo VPS with Ubuntu 20.04

Can you guide me or
refer to a youtube video

I will need this type of setup
at priority
because there is possibility
of acquiring a customer

Thanks,
Regards,
Murtaza Gandhi.