Making a database restore is easy. Open your backup file, then follow this.
cPanel -- > phpMyAdmin --> Import --> Browse the file (Your database would be ending with a extension of .sql), select that. Make sure to choose your format correctly and hit Go.
Then use FTP and go to your php_html folder, look for wp-config.php and make sure that your database name, id and password are set correctly.
If you have followed everything then Voila!! Your site would be up. The whole process would barely take 5 minutes or less.