Your mySQL database should be enabled by default.

The database name is in the form domain_com or domain_com_au - it is the same as he site name (or primary domain name), with underscores instead of dots.

The user name for the database is the same as your login that is used for getting into the control panel and FTP access.

For instance -

database name: acme_com_au
database password: acme

Before attempting to use your database you should log into the control panel, go to the mySQL database settings and set a password.

You can reference the database server from your scripts simply as "localhost".