When setting up a FTP Source Node this KB will walk through the steps needed: https://www.qvera.com/kb/index.php/2359.
A great place to see how to convert HL7 to CSV is in our sandbox enviroment, https://www.qvera.com/qie-sandbox-console/. Once you're on the sandbox page, use the drop-down in the upper right hand corner to select HL7 to CSV.
This KB goes over adding to a Database: https://www.qvera.com/kb/index.php/1803.