messing with textures in skyrim creation kit

Im looking to get the thieves den plugin in the creation kit.  I am new to the creation kit and modding in general but I am wondering what to do to get all the content for specifically the thieves den plugin and making it so I can edit them in skyrim creation kit.  I downloaded the converted oblivion meshes and im wondering which textures are specifically for the thieves den plugin (Think i found the ship portion of it) and where I have to put it and how I can find it in the creation kit to mess with.  Thanks in advance