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1. what is the process involved if I decide to apply through USCIS for change of employer
Your employer has to file form I-129 with the Labor Condition Application and filing fee.
It takes about 4-5 months for the approval.
You may not work for the new employer until approval is received from USCIS.
Here is link to form.
2. what is the process involved if I decide to apply by visiting the nearest consulate for change of employer
Exactly the same as when you applied for your E3 in Australia. You need to go online and file DS-160 at the consulate website; pay fee; make appointment and take with you all the very same documentation as when you applied in Australia, job letter, your credentials, accepted LCA, passport.
3.what is the process involved if I decide to apply through USCIS for concurrent employment
Same as answer #1 above but your employer checks box for concurrent employment. Part 2 #2 "d" instead of "e".
4.. what is the process involved if I decide to apply by visiting the nearest consulate for concurrent employement
Same as #2 above, exactly but the employment letter indicates it is a request for concurrent employment.
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