I have no idea what this mod would be about. You're far more likely to get people interested in joining up if you actually say what your plans for the mod are.
What is the purpose of the mod?
What is the goal?
What type of mod is it? Immersion? Overhaul? Additional Content?
Simply saying you want to make a "huge mod" is not likely to pull people in to want to help. A clear outline of your plans (which may change as the mod progresses of course) will help immensely in getting attention.
Thanks for the advice.
Enormous floating island above tamriel (or manage to make a visual of tamriel above). You can actually fall off of it; and if you do, you die. So does any NPC that falls, but respawns back up.
Alternate storyline. A long quest chain with a variety of new towns and a big city, each with it's own shops, bars, houses, military, etc. Also side quests inside the towns/city. Several dungeons with different themes and decoration leading a main questline that ends with a very long, epic battle. Custom objects and spells. Must be avaliable for NON SKSKE VAINILLA skyrim.
Also i want it to support online mode, which would allow co-op quests. --(not sure if even possible, but worth a try)
All this requires exterior and interior design with correct visual rendering and collision composition, actor design and voice-over, quest design and dialog redaction, programming, and a lot more.