Q1: Just look at the Microsoft events. They are large and they hand out all sorts of things. From free Microsoft software to other goodies. Let alone the information you get is great.
Q2: Become the best at the IT stuff in your area. Word of mouth is more powerful than anything. Online there are so many free sites like this one to get answers that it is hard to try and get awareness with the millions of websites out there.
Q3: Sorry but i only know general sites. Not any based in Aus.
C|Net, Neowin, WinBeta, BetaNews among the many others.
Q4: That one you will have to google specifically from where you are. Cause if anyone else tries they will only get generic results from the US or where ever their google homepage is based.
Q5: That all depends. I mean IT engineer's should be very educated along with well versed in their work field. Network engineer's are the same way. CIO's again the same. Everyone can be purchasing buiness software and storage. Anyone can do a home based business now. This question is just way to vague and can not be answered by a general site like this. You should contact a company that already does this stuff and get some real advice. Not something from a forum.