Quick Query (Perth)

Hi Guys,
Hopefully all going well, I shld be in Perth in Jan/Feb Protected content . I would be coming on the Skilled Migrant - State Sponsored Visa.
While I am gathering most of the info through various websites... I have not been able to find out about the following pts:

Once we reach there, what are the rules for leaving/re-visiting Australia? for how long can we travel outside Auz in the first two yrs of our PR visa (As we need to be in Perth for 2 yrs minimum as per the visa)

The ques is very important as I need to be in Brazil for the Protected content Cup for a month+ :) (Any football fans here)

Would appreciate your help.

Cheers!
Pankaj