Search engines use a number of different ways of placing results. Submitting your URL doesn’t really do all that much.
Do a Google search on SEO, and read a few articles like
this one.
The bottom line is, have your preferred search terms prominent in your template’s <title> tag, as well as in an H1 element on your home page, and in the first paragraph of your content.
It won’t hurt to have your URL in the "signature" of your profile, and participate regularly in forums relevant to your site’s subject.
Proper structure (using H tags appropriately as in an outline, not too much junk before your main content) and clear, informative content is the single most important part of SEO. All the other "tricks" have been beaten to death by search engine spammers, and are mostly ignored by the search engines now.