National Office of Overseas Skills Recognition (NOOSR)
http://aei.dest.gov.au/AEI/QualificationsRecognition/

Trades Recognition Australia (TRA)
http://www.workplace.gov.au/tra

If you have your qualifications assessed, it does not necessarily mean that you will find work in that field as soon as you arrive in Australia - in fact, once your visa has been approved, you should start researching your industry, looking for work and building a new network of contacts immediately.

The Australian Government is currently encouraging migrants to work in regional Australia, so if you are prepared to live and work outside the major cities, your job search may be quicker. You should have evidence of your educational, trade and professional qualifications and references from previous employers (all translated into English by an approved translator).

Another factor is your work experience, which similar to qualifications, may not be taken seriously by employers and recruiters. You often hear that companies require 'local experience', so you may find yourself in a vicious circle. It is often good to prepare yourself mentally and look for a less skilled job than the one you held in your home country (and unfortunately less pay), but that way at least you are getting local experience. It is helpful too if you can find this work with the type of company you would like to work for in the long term.

After a year or so you can rely on your 'local experience' more and look for a job that will showcase all of your skills and have a salary to match. When out-and-about looking for a job be mindful of Australian customs. Presentation and grooming are very important, followed by your attitude. If you come with the attitude 'I'm not going to get this job', you probably won't get it. Inform yourself about Australian customs of when to shake hands, direct eye contact, focusing on task at hand rather than the relationship etc.