Just submitted your site to search engines isn't going to do much for you. You need to optimize your site for search engines, and try to keep the spiders coming back to your site. That means fresh content, updated daily or weekly.

Have a look at this: http://www.seomoz.org/beginners.php, that should give you an overview of what you'll need to do to SEO your site.

I think you're running phpBB, there's lots you can do to that software to optimize it. Search for the able2know SEO mod, that does some good stuff for phpBB.