Cosmetic Directory Sales

We run www.cosmeticanswers.com and are in need of some freelance sales support. We have a section that is a business directory -- like a yellow pages. We are offering annual listings to businesses operating in the cosmetic sector (for $500 per year). Prospects include cosmetic surgeons and dentists, spas and clinics, salons, and retailers. We have a prospect list of over 10,000. We are looking for a skilled online ad sales person to sell these ad listings for 20% commission to be paid weekly.