Ann_Smarty - 6:46 pm on Nov 6, 2012 (gmt 0)
There is one great video telling the story of how reddit founders promoted the community:
There are many things in it to learn from, I think.
The first part I'd start with is forcing some activity. Reddit created fake accounts - it might be not the best option but inviting your friends and getting heavily involved in answering / asking questions there is the first thing to do.
The best tool is the one that is heavily used by the creator. So becoming the active forum user is the first step, I think.
Also, it needs some time... If people see some activity there, they will start getting involved.