It seems that Site Sculptor may require database details in order for the integral CMS system to be able to store its data. I don't know if you still need one if you uncheck the boxes in the GUI to create a CMS for your pages.
I posted a beginning to end process example HERE in reply to someone else that you might find udeful.
If you have installed XAMPP and started both the Apache and mySql services, you can create a database using phpMyAdmin on your local machine, you should be able to access phpMyAdmin by typing (and bookmarking) phpmyadmin/ in to the address bar of your browser. You will HAVE to have set a 'root' (super-user) password for the mySql database before you can access it from DreamWeaver.
All of your site's files and folders must be in a sub-folder (your site folder) of your xampp/htdocs directory (wherever you installed it) so, if you installed xampp to your c:\ drive, your sites files and folders should be at C:\xampp\htdocs\mynewsite (for instance).
Your connection settings for your database on your local machine when you set it up in Dreamweaver would be something like:
$hostname_PowerCMSConnection = "localhost";
$database_PowerCMSConnection = "yourNewDatabaseName";
$username_PowerCMSConnection = "root";
$password_PowerCMSConnection = "yourNewPassword";