Online business development manager

We are PSD to HTML company and looking to source more projects from bidding sites like Elance, ODesk, freelancer.com etc. Looking for a partner who can work on commission basis to search PSD to HTML projects on such sites and put together a winning bid or regular basis. We are looking for someone who has experience in the field and has proven track record of producing results. If the results are good we can work on a fixed cost pm/along with some commissions. Please describe in detail how you can help and show some examples if possible.