custom-developed CMS Website - PHP and Mysql

I would like to enhance or update my existing web site for better functionality and look. A small website (non-profit) that is on a shared unix server utilizing with php and mysql. current site: [login to view URL] . I want to upgrade the login process with a better form then I currently have. Current members should have no need to re-register, but ability to update their profile, so developer shpould just transfer the old member profiles. Ennsure that the registered members can still access the member areas with their login info. Key to this development is the forms. I want nice looking forms. For registration forms, the whole database storage functionality and input field verification would have to be adapted to my application. Also a check box on the form that registrants agree with the rules of the site and email group that is part of it. Administrator should be able to view at a glance all the members details from a administrative page, and approve acceptance of applicants, before give access to site. So there will be member only pages and administrative pages. Also, those that register would be pending until it's OK it at administration side. Feed back form page and FAQ's and expandability to website.