Once you have the required documents in hand, you must head to the U.S. consulate in
Australia or internationally. You can even choose to complete the process in the U.S., but in
most cases, doing this in the U.S. makes the process take longer. In this case, you will need
to apply with form I-129 and then take it from there.
if you are applying for an E3 visa for the first time, it is highly recommended to do it from
Australia.