There are many different ways to promote your site. As mentioned above, visiting forums is one source - but there are many other ways. Getting your website indexed in all the major search engines is a big plus, but in order to rank well within the search engines you need to focus on backlinks to your website - lots and lots of backlinks. You can get these links by posting in forums with your link in your signature, submitting to directories, by purchasing links from companies such as
Web site link popularity - site page rank - buy web text link and by writing and submitting articles to article directories. All of these are fantastic ways to both increase your websites link popularity as well as its overall traffic.
Hope this helps!