Seo help for my forum

[Gaijin]

As I can see, Ace can handle this, though one thing is important to know about Search Engines.
Google for example, will look first for sites that have a domain that matches the typed keywords, second step is, it looks for pages that contain quality (yes google bot can recognize this) content based on the typed keywords, and then it looks for popular pages within these results. Popular pages are the ones that have most back-links, a back-link is link to your page on another page.

Backlinks are the most important thing for a website, then comes the "quality" content....
To get a decent amount of Back-links you will need to advertise your forum, for example in a signature like the most do, this is quite a good way to generate amazing amounts of backlinks, be aware that your signature doesn't help if the topic in the thread isn't like th main topic of your Forum, other way is to ask for link exchange on sites that cover your topics.

Just get out and spread the word, google can find you if no one yells your sites address...