I agree with Agreas. Even large known mod teams like RTR for example has trouble attracting the right people.

Since this is your first time attempting to mod I would suggest to do a minimod base on existing mods out there. Arthurian TW might be a good start since it's basically the same period of you intended mod so at least uyou have the map ready.

Or you can base on Chivalry for example, but since you mod starts from 600 AD, any BI mods should be okay.