Forum Moderators: rogerd
There is a great thread in the forum library [webmasterworld.com] which you should read:
That should get you started with some ideas!
It it's all new, you have a double challenge - you don't have the benefit of existing traffic from search engines and repeat visitors, so you have to build traffic AND get those visitors to participate in your community. Good luck, this forum has a lot of experienced community-builders to help answer your questions.