Mine has been live for a few years and I can tell you, it takes a bunch of patience. Ive learned that it's not good to have too many empty boards. (although some of mine are empty) after about 2 years, I have 60 members, although registration has seemed to pick up in the past few weeks. But hey, that could just be coincedence.
I can say that if you try to get friends and family to post, remember that most won't, atleast that's what I experienced. I don't know if it's because they just aren't interested or if they just don't know how to navigate forums. I would bet on the latter. Most people I interact with say they aren't sure how to navigate a forum, hence.... They don't know where to go in it.
Good luck with your forum and remember to have patience:)