I'm not really an expert on the topic, but I guess it depends mostly on your ability to create a universe for the rest of the players to play in. A palace with hidden rooms and such sounds good, but it's not much to go on.
Furthermore, in case you weren't aware yet, freeform RP's are currently no allowed as far as I know, so be sure to create a good system/rules/etc. or the mods will probably not approve your game. I found this article under the help&info section articles that might be useful.