room finder for all users

I would like to setup room finder in Outlook 365.

I read the webpage for creating a room list.

Other webpages show how to create Room List Distribution Groups.

Some webpages show how to create room mailboxes.

I am confused what the proper procedures.

Can anyone show me?

Furthermore, even if a room list is created, is it only the creator can select the rooms? Can everyone in the network share the room list and select the available rooms?

Thank you very much.