i'd definitely have a few friends or webmasters seed the board with posts so it won't look too empty. it's a lot harder to get people to sign up on boards that don't have much going on.

sounds like you have a good idea of what forums to have up, although if you're going commercial i can't see the point of lifestyle talk. and if you are gonna have more personal stuff as well as commercial, you could have a hookup board or a board where guys can talk dirty to each other.

after you have some members, you might consider inviting some of the more approachable models from various sites to do scheduled chats on your board.