So, do you have a complete outline of your plan? Where is this set? In Skyrim, in another place on Tamriel, somewhere new entirely? Do you understand what is involved in making a new worldspace? Do you have a list of necessary characters and events? Do you know what sort of scripting you will need? Are you planning on incuding new Items/Weapons/Armor? Do you know how to work with meshes and textures? Do you understand the complexity involved with them even if you cannot do them yourself? Do you have quest frameworks? Do you understand the limitations of working with the XBox instead of a PC?
No one is going to want to help if you don't have decent answers to all of those questions. Far, far too many people have come along with OMG AMAZING ideas for a new DLC sized mod with all sorts of amazing things, and almost nothing has ever come of them. Calling for "Experienced Modders" to help you is, perhaps, the very worst way to go about doing something like this.