Depending on how long the articles are - you say you have tons of them written, so I'm guessing they're shortish - I would start by uploading ten to twenty of them. That way when people come to the site it looks full and this encourages people to see it as a serious site. After that I would publish between three and four a week, drip feeding them as people here have suggested.
By doing it this way, you get an instant bounce from having a site filled with content but you also get the search engines to keep looking back for the newer content. Google likes good content, it likes full content and it likes new content. As you already have the articles, all you need to do is set it to upload a new article every few days and you should have no problem.
