I am really confused about getting the workflow and automation working in this senario:

Every 3 months an email report is generated showing the list of computers in our Disabled Computers OU

The email report should start the workflow and notify the approver to approve the automation of deleting all disabled computers within the Disabled Computers OU.  Once the workflow has completed the automation task, an email is sent showing the computers that were deleted and the workflow has been successful or failed.

I could do this as a scheduled automation task but would prefer to use the workflow to have an approval and also forces someone to look at the list.