there is really no need to yell or panic
AOR = Acknowledgement of Receive, like the name suggested it means they have got your application...
The application number is for you to check your application status on eCAS (http://www.cic.gc.ca/english/my_application/status.asp)
After AOR, the next step should be SA (sponsor approval). If you have done medical exam and sent everything (police certificate, the right of PR fees etc.) in the original package then you might get SA, AIP (approval of the principle applicant) and DM (decision made) notice in one day.
I highly suggest you take a deep breath (chill buddy) and browse through the spreadsheet...