PHP Website Error Fixing and implement a basic crm as decribed below.

My PHP-based site has been accumulating a mix of front-end and back-end problems that now needs to be fixed + i need to implement some new functions. Here is a comlete list of what needs to be done: 1... (Budget: €30 - €250 EUR, Jobs: Backend Development, CRM, CSS, Debugging, HTML, JavaScript, MySQL, PHP, Web Development, Website Design)