Hi John,
The current release of Adagio Invoices has a complex, fixed import structure. There is documentation on the layout in the help, and sample import files available in the sample data installed with the program. You'll need to figure out the best way of exporting the information out of QuickBooks and dealing with different field sizes.
If this is a one-time operation, you might be better off to contact Dakota Software who are highly skilled in converting QuickBooks databases to Adagio. I wouldn't recommend trying to do this on a daily basis. Just enter your invoices directly in Adagio invoices and print them from there.
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Andrew Bates