As with other English speaking countries, Australia is committed to equal employment opportunities for all, and your qualifications and work experience (and to a lesser extent flexibility) will determine your career, not your nationality.
How much value Australian employers place on your qualifications, certificates and references varies from one to another, but you should expect them to not regard them as highly as an employer in your home country would as they will probably be unfamiliar with the institutes that issued them. Ones acquired from Australian institutes are generally given preference so be prepared to convert or top up what you already have if you are planning on a long term career in an industry in which they are particularly valued.
Similarly, the experience you have gained from working outside of Australia wil not be viewed in the same way as if you had spent that time working within Australia. There is not anything underhand about this, it is just that employers would rather employ people who have worked for companies that they have heard of rather than obscure ones from another country. That is not to say that your past work experience is irrelevant, it is not at all, it is just that you will be at a disadvantage when applying for jobs that people with in country experience are also applying for. Therefore, you should be prepared to have to accept lesser jobs (in terms of skills required and pay) until you build up some local experience.
Depending on your qualifications and experience, job prospects may be better in one part of Australia than elsewhere. For example, if you have a background in manufacturing companies, you will have more chance of finding a suitable job in Melbourne, and to a lesser extent in Adelaide. If you have worked in finance companies, Sydney is the major centre of employment, while those with a background in resources should look at Perth. You may need to live outside of the major cities though, where there is less competition for jobs.
You will likely be earning less, and being taxed more, that you were in your home country. Yet, despite having less money coming in, most people who emigrate to Australia find that their overall standard of life improves after moving to Australia. It is consisently ranked highly in the various international quality of life indexes that are carried out, and low in the the level of expense based ones, with Melbourne, Brisbane and Adelaide doing particularly well when two such indexes are cross referenced.
You will also need a visa in order to work in Australia, with the skilled independent visa being the best option for most people. The skilled independent visa is a residency visa that is open to people who have qualifications and skills that are in demand in the country. It is not necessary to have an employer to sponsor you to obtain one but you will be asked to pass a points test (which evaluates your qualifications, experience, aptitude, etc.). A business visa is a similar option, which is often applied for by those whose skills and qualifications are not judged to be in demand by the Australian government. It does not require you to pass a points test so long as you are sponsored by an employer.