Hello, welcome to my community if you are interested in something really simple like a staffmode but with not a lot of features that confused you, you can try this plugin!
STAFFCHAT
You can change this message on messages.yml
STAFFMODE
STAFF TOOLS
FREEZE
Also sorry for the spanish on some messages, when you donwload the plugin you will see it on english.
VANISH
The spigot didn't allow me to send more pictures so you can see the other features when you install the plugin, enjoy it!