If you came in through the main doors, you clearly aren't an intruder-- they wouldn't have made it a step through the door. A huge, open hall stands before you, anything but empty and leading to vast amounts of halls. There are curving stairs at the end of it much like in a ballroom, but you would have to walk very far to get to them so it might be a better idea to use the ones closer to your left and right. Upstairs are normal bedrooms on the second floor and the heirs and Brian's on the third.