Okay, this is something you need to know.
Nobody will join a newbie modder to work on a mystery mod project.....everyone has their own ideas, your basically asking people to volunteer for work....so if you want people to help you you've got to sell it to them. Dont worry about people 'stealing' your ideas. I mean really 'sell', pictures, plans, your skills etc. Quite frankly, without anything to show, you won't get experienced modders doing things for you, at best you'll get other new modders and the project will end up collapsing from in-experience.
Since you are new, you also don't have any experience with modding which means you can't actually do much to help on such a project other then give ideas (and as I said before, everyone has ideas). Learn how to use the Skyrim CK, start working on your mod, ask lots of questions and learn. Once you have something to show towards your mod, then maybe you might get attention from people that want to help. Then you will know what is possible with the CK, you will show you have dedication to your project and it may inspire others to join you.
You will end up doing the majority of the work on any project, modding is not something you can just palm off to someone else.