Information about this particular Heaven, and the current situation with gods and shinki being drawn from different worlds. You could argue that the bulletin board system would explain most of that, but as you've noted it can be tedious to sort through all the notifications.

Information about the role of a shinki and how we are to fulfil that role would be helpful as well. There is an expectation from the Heavens that our gods are supposed to bring us up to scratch on our new existence as shinki, but not everyone has a god that does so.