QB Issue Resolution:

You are buying the business, is it a sole trader or an ltd/corporation? that makes a world of difference in how the accounting is done.

the amount you purchase the business for is part of your equity and yes that amount should be in QB and you portion that amount out to cover what it is you are buying with the business, inventory, furniture, equipment, etc

You can create a cash type bank account to get started and use that to show deposits into the company and expenses paid, without an actual bank account being created in a real bank

To get started correctly you really need the help of a local QB person or accountant, there are just too many if-this-then-that scenarios to consider trying to do this over the net.

And most of us are from the US, so AUS rules while similar might be different in critical areas too

Resolution for Issue 'How can I enter expenses before I have a bank account set up.' available: Yes (Solved).
Source: Intuit Community forum.

How can I enter expenses before I have a bank account set up.: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for Bank Account
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Error Recovery for Bank Account [Canada]
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