Jitsi.meet in our server

In our Public Institute for Vocational Training already we have try yours videoconference service meet.jit.si ic in some of our classes.
So we decided to install the platform on our server.
I would like to ask you where could we find instructions for a full installation. Our server is an Ubuntu 18.04 LTS (Bionic Beaver) with 8G RAM.
And one more question.
How could we set a password or something else so our service works only for us. So only our teachers could create rooms and no other couldn’t use it for create rooms.

Guide to install --> https://github.com/jitsi/jitsi-meet/blob/master/doc/quick-install.md

I’m looking for this too

I have a question to.
What are the requirements of a jitsi server?
Thanks