Welcome to the Community, @tonyanathan.
You can look for a program or software that can convert your file from PDF to CSV via Google. This way, you'll be able to import your bank transactions to your QuickBooks Self-Employed (QBSE) account.
Once you've already converted the file into a CSV, you can read this article to learn how to import your transactions: Add older transactions to QuickBooks Self-Employed.
Just in case you want to manually add transactions in QBSE, feel free to check out this article for more guidance: Manually add transactions in QuickBooks Self-Employed.
Please keep in touch if there's anything else I can do to help you succeed with QuickBooks. I've got your back. Have a great day!