"Isn't there a database for download that contains the correct info?"
Well, the correct info in the database is subjective, it will depend on the needs of your business. We offer a sample database here
but even this will not be the correct structure for all use cases.
you may need to edit the table structure for the needs of your business.
a business that sells cars will have different needs in the database structure to one that sells cloths or one that sells sporting goods or one that sells music and so on.