Create HTML5 responsive corporate website

We need [login to view URL] like website for my company with a renewable energy theme. Looking for a professional or team of professional with a deep portfolio to show past track record. Winning bidder will have to: 1. Provide a mock up before work starts 2. Estimation for how long the task will take. 3. Document technical aspects of how to update various corporate information to reflect future changes. 4. Configure contact forms to send email to corporate email address.