To get the data into QuickFile, you would need to import it as a CSV file, which should be obtainable from QuickBooks. The main things here would be:
- Clients
- Invoices
- Maybe even bank transactions
You can find templates for these, here: https://community.quickfile.co.uk/c/knowledgebase/getting-started
This thread may also be of interest: Importing from quickbooks (all transactions)