Web site redesign

We have a site already done with php+mysql, but it looks not that great and we are also not good at English, so we need: [1] You re-design the website, including the logo, banner, web structure. You only need to preserve a few good points from current design. [2] You need to write all the wording in this site. Currently there are some on site, but not professional. [3] You need to implement all your work into our current php+mysql code without function changes.