The reason you're not going to get many responses is because your question is too broad. There is no miracle way to suddenly get traffic to a new site, and if there was, the person who knows it isn't going to spill the beans
Put a link to your site in your forum signature and post here and on other forums that have your target audience. Do link swaps. Submit to link directories. Set up a Google sitemap. Read read read

Lots of good tips throughout these forums.
With a lot of hard work, it IS possible to grow a site from scratch without a financial investment out of pocket. I did it with DaniWeb.
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