I don't think anything would really prepare you for it. But it gives a basis to learn?
Mostly exploring, dealing with the... insanity that happens? Weird stuff happens at night, you'll need to find a place to sleep, but there are rats in a few places, some are cleared out, some aren't. I think some of us are going to the main rooms to bunk down.
The house is a lot haunted, so be prepared for that.
We're trying to find this Reginald T... what's his face, maybe that'll get us all home.