Fresh run. Just have enough experience of the raid so as we don't have to spend too long on explanations. As a team we haven't cleared this but have spent plenty of time on the last encounter. Time to get it done!
The game creator, CraftyWollstone, should send out invites 5-10 minutes before start time. If you don't receive invites, the creator may have left so start inviting each other through xbox/psn/pc on your own.