I have done this for another company and now maintain the website. I moved the site from a html/php to wordpress, taking the content from the old and creating a new structure in WordPress.I should be able to do the same for you now that you have chosen the theme.
All I need is a username and password for the WordPress site. There are two ways of transferring the material, either from the site as it appears or via ftp (ftp requires another password and username).
I have been working as a freelancer for ten years in two areas of project management, web work and publishing, related of course. I have used php/html/css for most of my projects on the web. I would be happy to provide references for some of my web work, if that would be helpful.
I look forward to more information about the project so that I can confirm my bid and to assure you that I can complete the project on time and within the budget.
Regards,
Stilman Davis