@pinoytalker @agentKams Thanks for the link, its helpful for setting up your myGov and ATO account. As for the actual steps during lodge, I am unable to find any tutorials. However, in the same link that you provided, there was a link to something called Tax Help Program https://www.ato.gov.au/individuals/lodging-your-tax-return/tax-help-program/ although you need to fulfill the specific criteria to avail of this service.
In the end, I asked one of my teammates here in the office, turns out he uses the ATO to lodge his taxes and he gave me a few pointers. The most important bit that he told me is that once you click the lodge button, it doesn't mean that its touch move. You can edit / update or even cancel your lodgement anytime.
So I went ahead and click the Lodge, saw there were 4 steps:
Contact Details (easy) - just update your details
Bank Details (easy) - just update your bank details to where ATO will deposit the refund
Personalise Return (hard) - there's alot of checkboxes here, I haven't figured out completely which ones I need to check, still in-progress for me, you can put some temporary checkboxes if you just want to be able to get to step 4
Prepare Return (hard) - this is where the PAYG is meant to appear, pre-filled once your employer(s) have reported it here as per my understanding. this is also where you put in the tax deductions if any, finally it has the calculate button to determine the tax refund correct? Again like step 3, still in-progress for me, since there are no PAYG yet.