Google adwords always

http://www.myspace.com/sevenstringdotorg

10,000 profile views, and not one of the above.

Dont span other forums it will just make you look bad

I am sort of a newb when it comes to webpages, I have my webpage, only a week old pretty much and I don't know how to get people to go register on it, except maybe asking people on facebook, that's the best I've come up with. Is google adwords the best?

http://www.smashwii.com is my webpage, please don't laugh, I am a newb at this, but want to learn and am getting better.

SEO and related (like posting on other forums, but no spaming) usually does good for random people.
Word of mouth like was suggested is better for people who will be really interested in your forum.

In any case, you better try all options and see which one performs the best.
I put lower attention on less effective ways, but I still do it.