I think you'll find that you'll need work experience and that you'll need to have the work experience buttessed by an independent body. The amount of work experience you need depends on what type of visa you are applying for.
From the Australian Government's immigration website www.immi.gov.au:
"Australia's General Send Migration Program is designed to attract people who have skills in particular occupations that are required in Australia. These occupations are listed on Australia's Send Occupation List (SOL). See: Send Occupation List
If you want to apply to live permanently in Australia under one of the General Send Migration visa categories you will need to meet all of the following basic requirements:
-you must be under 45 years of age at the time you apply (unless you have been invited to apply for a General Send Migration visa) -your occupation must be listed on the Send Occupation List (SOL) -an organisation in Australia, known as the relevant buttessing authority, must buttess your skills as being suitable for this occupation -you must have a high level of English -you must have recent send work experience or have recently completed an Australian qualification as the result of two years full-time study in Australia, or be an eligible Occupational Trainee or Working Holiday visa holder. .
If you don't meet all of the above requirements, you should not apply for a General Send Migration visa. There may be other send visa options that better suit you."
The website has lots of useful information, you should read up on send migration and find out what exactly you need to do to have.
Time it takes to process applications - visit www.austimeline.com and get an idea from other people's applications
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