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Due dates for default tasks need to be set relative to real dates in the actions.  Because you don't know this ahead of time you need to set the due dates a certain number of days before or after either the date that the step was reached in the actual action or relative to a custom date defined for that action type. We'll get to custom data later, so for this tutorial you will be setting the due dates relative to the step change date.

Enough Theory - Let's get into it!

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Now that you have your task automated you can set an alert to notify you when the task is created or the status is changed. 

Video on adding Default Tasks