Article writing and submission (Both)

We are wanting many articles to be written. We want an explanation of how you keep from having duplicate content in each article and also if you submit the articles. If you do submit the articles what are the site pageranks where they will be submitted. We want them to be keyword rich. Keywords to be used; hCG, hCG Diet, Buy hCG, order hCG, Purchase hCG, Wholesale hCG, hCG Drops. We are currently getting 3000 unique visitors a day [login to view URL]