Read the Palace Rules . The very first time you go to each Palace room, it will take a while to download the image for that room. Be patient because it's only the very first time that you go to a room that you'll have to wait. This will enable you to go to the rooms instantly without waiting. If this doesn't do it, put them in a directory called Pictures under the Cybertow directory under the Media directory under the Palace directory.
Custom sounds are on their way.
Once inside, you'll select an avatar to represent yourself in this graphical environment. You can choose a pre-made avatar or make your own if you wish. You can even dress yourself up any way you want by opening your prop bag and selecting the costumes and props of your choice.