Don't think there is any set Melbourne area, there is a small GA area in one of the pockets where most (not many) of the Melbourne supporters seemed to go last year.
Probably best to buy a GA ticket in advance and rock up early to get a GA seat.
MFC website has the game at 12pm
http://www.melbournefc.com.au/news/newsarticle/tabid/7415/newsid/108513/default.aspx
Might want to change the thread title..