Welcome to QuickBooks Community, avekeller. I can help you find a sample format in QuickBooks Online (QBO).
You can refer to the steps below to import data and get a sample spreadsheet.
Go to the Gear icon and select Import data.
Choose the type of information you need to import or get sample data for. [For items, select Products and Services].
Click Download a sample file link to get a sample spreadsheet.
Hit Browse to choose the file you need to upload.
Then, follow the on-screen steps.
However, we don't have the option to download a sample file for bank transactions. To know the template and file format for uploading bank data, check out this article: Manually upload transactions into QuickBooks Online.