Good Day All!!

We are very interested in immigrating to Australia, my husband applied for a position (QC Advisor / Engineer) at a company in Perth WA, City of Stirling, he went for an Interview with representatives of the company in Johannesburg. The MD of the company wants to meet him in Germany for a second interview so we are not 100% sure that he has the job. What I want to know form you is if anyone can help us with some questions we have no answers to: What is the cost of living for a family of 3 (Husband, Wife and 3 year old Daughter) What is the average salary to make a good living (I wont be working) what will be the first steps to take, what document must we start with to speed the process – I am sure the company will sponsor him with a 457 visa, so in other words what paper work can I stat with, (I have so may questions and feel very lost) If someone can also tell me more about Perth and the people living there. Is there a way to convert the salary my husband is getting now to more or less know what he must get in Australia? If there is anything else that I need to know PLEASE LET ME KNOW….. Thank you for you kindness XXX