Good luck with your move. I've been living in
Australia for 8 years now and am officially getting sworn in as an Aussie Citizen this month. My husband and I have lived in Brisbane for 6 years now and love it!
Justsplit is right about housing affordability between Brisbane and Melbourne. However, I think job prospects in your fields are better down south. As for the driver's license- it is dead easy to get. Download the booklet from the whichever state's website and read it. Then all you have to do is write the multiple- guess test.
The only thing I can really say is be prepared for everything to cost A LOT more than what you are used to: cars, food, petrol, rent, insurance etc. Get a medicare card straight away and then get private health cover- MBF or Medibank private are very popular.
Some other odds and sods:
Depending on how old your child is daycare is near impossible to find and expensive. Public schooling is good depending on which area you decide to settle in. Again contact the relevant education department in that state.
Have you considered what you are going to do with your RRSP? You will need to consider this in advance.
Don't bother bringing any electrical goods and the associated 'transformers' with you. It'll be easier and less expensive to buy new ones once you're here. Bring your computer tower (provided you can switch to 240V) if you're really keen to keep your programs and data. You can easily buy cords etc here at Dick Smith.
Take a couple days off halfway through your trip over. Either Honolulu or Fiji. It'll help with your jet lag - it will knock you for six.
Speaking of 'six', read up on the rules of cricket. The sooner the better mate! Most importantly always note that playing a game for five days with a draw is more than acceptable in any gentleman's sport.
Declare everything and I mean EVERYTHING at customs. Food, lollies, anything organic like wood, stuffed animals, scented satches (potpourri), Swiss bank accounts (just kidding) etc. They will scan your bags regardless. Better safe than sorry. Customs are really good if you are up front and honest.
It's well worth it. All the best.