I understand that you want to develop a marketplace website, so is there similar features like Freelancer or Elance website? Please provide me detailed requirements or at least high level features to estimate it precisely, because based on the project description, it is hard for me to give you any estimate.
Our current bid is just a placeholder to submit the proposal, as we still need to finalize the scope of work.
Look forward to hearing from you.
Regards,
YK
LEADconcept