Well... setting one up is not rocket science at all.
I've uploaded a pic of what you probably want to check/set, as your group set up (don't copy the name and descrip).
Basically, name, description. Setting it to invite only is probably easiest, not sure on exact settings for moderated (ie, if you have to check every message posted, its going to be a pain in the arse). You can then invite people into the group, so entry is strictly controlled. Senior moderators and site admins can see the group regardless.
Don't know if you want to allow albums, messages, normally ya do (might want to post pics of those luvly coffee thing what ya call its)
Key, is the last option. No-one can see the content unless they have joined (which they can't without invite).
Easy enough... pm if you need more details, or just post here. Feel free to test it out, you can delete the group if you mess it up anyway.
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