Hello Grry,
Welcome to the Community page,
These articles will help you to export your data out of Quickbooks -
https://quickbooks.intuit.com/learn-support/en-uk/import-or-export-data-files/export-data-out-of-qui...
https://quickbooks.intuit.com/learn-support/en-uk/manage-lists/export-reports-lists-and-more/00/2397...
When you export data out of QuickBooks it goes to an excel document where you will be able to save as a CSV file in there.