"Please update your order ...
Product Name: Fantasy Backgrounds I ... Quantity Units errors -
You ordered a total of: 1 Units: 0"
In the product entry screen in the admin set these to the defaults

Code:
Product Qty Minimum:      1
Product Qty Maximum:      0
Product Qty Units:        1
And there's also a place under the product name on the product page that says "Model:" do I have to have this there or can I remove it?
Admin > catalog > Product Types > at the right select "edit layout > Show Model Number > set to "0"