Manage clients, orders, products from Website (PHP)

Hi Coders, I'd like to have a web application which helps manage clients, orders, products via forms. The code should be implemented in PHP/HTML/Javascript, so it can be easily located on a Linux/Windows machine and using it straight away. For the database, I guess that MySQL is the preferred way to store the database? Please, find an attached document with more detailed information and let us know your bid or questions. Thanks, A.