Solar Panels

[Tech City]

Hey Guys,

I'm looking to invest in Solar Panels for my home but I don't really know too much about them.
What are some good companies to look into?
Is there is a government rebate?
How much approx. do the the solar panels cost?
What is the difference between the different panels you can get? What's better?
(There are only 2 in my household with a bub on the way)
How much do they save? Can you actually earn credits with power companies if your consumption is not too high?

Can you get solar panels as an alternative for the hot water system instead of using gas? Are they the same panels for the electricity as well?

Just trying to get some info from someone who has solar panels.
I'm located in Melbourne.

I have seen a couple of commercials on tv but thought i would get some info first.

Cheers.