Unfortunately, PHP is not plug and play.
So there arent really any scripts you can just "add" to create a content management system like wordpress, (but you just gave me a good idea)
installing wordpress or something similar might be a good task for a beginner. Understand that PHP and MySQL are complete independent thing and each will take time and lots of trial and error to become proficient.
Get started with some PHP tutorials, you'll come to know and love www.php.net and these forums, as well as www.w3schools.com and other sites.