If you're planning on installing PHP scripts or running a dynamic site, chances are you're going to need to create new empty databases to populate and make your script run.
Creating a new database is as simple as logging in to your cPanel and clicking the Database Wizard icon, and the Wizard will walk you through it quickly step by step.
This feature will provide you with a DB name, DB user, and DB user password for use in your script's configuration file. Note that the MySQL location will always be "localhost" when setting up your script.