Hello,
Deal of the Day, is a very important feature of Volusion. I am not sure why you want products to be automatically selected. In fact it should be you, who should be controlling what the deals are.
Anyway, if you want assistance about how deal of the day works or need help setting them up, let me know. But surely, it cannot automatically pick up products from your inventory.
Or most important, if you want to display the deals on your home page, let me know, we can help you do that too.
Regards,
Snehal Shah
Volusion Expert