Like BluePyre, I'm not quite sure I inderstand your question. But if you have an existing backup of a MySQL database (a file named something.sql), Then you can create and add that database with the following commands:
mysqladmin -p create newDBname
mysql -p newDBname < something.sql
You will be prompted for your password after each command (that's what the -p flag does). You can check that this worked by listing the tables from your database with this command:
mysqlshow -p newDBname
While I haven't used any GUI for MySQL, phpMyAdmin
is quite highly recommended in the press and on this forum.
 How rude of me! I forgot to welcome you to LQ.org . . . So, Welcome! [/edit]