There's no point creating a community for your project until after
there's a reason to.
I plan on putting together a high quality "official website" for my game, with a full feature forum and the whole sha'bang. But right now there's just not a big enough demand from it. Sure, I might get some JGO people over there.. maybe the oddball gamer. But it would be doomed to fail. So I am waiting until I have some real interesting gameplay to show off, something that more than just what us crazy devmonkies want to see.
Just remember, building a website/community won't help boost your popularity unless you already have a reason to be talked about. If your project isn't interesting to the people outside of the scope of fringe-interest communities (like this one) then you'll just be spinning your wheels.
My advice, get your game to the point it gives people something to talk about, then make a community site for them to talk about it.
Just know your demographic, almost all non-programmer types will only care about your game if you show some solid, unique and cool game play. They don't care about technical details. That's why even though I feel I have a pretty good map editor for my current game, there's no point talking about it to the general public outside of JGO because they don't quite understand/appreciate the work behind it. They'll just say "no gameply? lulz wutevr" and leave. Where as people on JGO will appreciate the work involved in a map editor, and find it much more interesting.