The whole process is online now, go to the e Visa website, login, start uploading the documents and entering the data as the program requests it.
Check that you got the data entry correct before you submit the application, because data entry error results in an automatic denial.
It's a straightforward process, no need to be worried about it, it's not a bad consulate to deal with.
If they need more documentation they will email you.
If you have other questions you could always post on the Aussies in Thailand FB group and ask as you'll get better answers there seeing as those people only use Sydney or Canberra for visas.
This is the website
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