For first time noob like me, just sharing this info to all future applicants.
To check whether your ETA has been successful, do follow Ms Kang's instructions. IMPT! You need to Apply for an ETA so as to Check for your ETA (I was like what??? Yah, it was troublesome to key in all the info once again... best if you could organise all the requested info onto a table in Word doc.). After the website will ask you to confirm all info and click NEXT, you should now be able to see your approved VISA application together with the Reference Number
(unless special cases as stated in her instructions)
You then can use this given Reference Number to Check your ETA again... and again
Thanks Team Kangaroo