I am considering relocating from Los Angeles, California to Sydney. I'm a single girl, so no family or partner to worry about. Most of my family (aunts, uncles, cousins) are living in Australia. I found out I can qualify for a resident visa since I have a Bachelor degree in Computer Science and 10 years experience as a software developer (software developers are on the needed skills list), as well as a visa sponsor. I also have an MBA and my most recent work experience involves software sales for IBM and a Product Manager position at an online retail company.
My questions primarily revolve around the difficulty of finding employment. As a permanent resident, but not an Australian citizen, how hard is it likely to be to find a position as a software developer or in software management? On average, how much can I expect to earn with an MBA degree and 12 years of work experience? I've heard it's expensive to live in Sydney - does anyone know how the cost of living would compare to Los Angeles?
Any information you could give me at all would be so greatly appreciated.

Thanks so much.