QB Issue Resolution:

You can’t create your own sample / practice company, but there is one you can login and use. http://qbo.intuit.com/redir/testdrive You can do whatever you want to test things out. Nothing is saved after you close it or log out. When you login again, it is re-set.

Resolution for Issue 'I’m a new customer to QB on-line and have completed the initial configuration. Is there a way to setup a practice company session to learn about the functionality?' available: Yes (Solved).
Source: Intuit Community forum.

I’m a new customer to QB on-line and have completed the initial configuration. Is there a way to setup a practice company session to learn about the functionality?: 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.

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