@Bagongluma if anything, ang bata mo pa 🙂 the world is yours. now, to your questions:
1) kelangan ng PDOS para maka-alis USING philippine passport. pero since may OZ passport ka, pwede eto na gamitin to. and if i am not mistaken, di ka nila pipigilan. ung cousins ko have both canadian and philippine passports. canadian passports ginagamit nila everytime bumabalik sa pinas, so di na kelangan ng PDOS. if you want confirmation, pwede ka tumawag sa BI (immigration).
2) mangga-galing ako ng SG, so di ko alam 🙂 but if gusto mo, pwede ka dumaan dito kasi maraming promos ung mga airline na mas mura kesa from pinas.
3) most banks charge you pag di mo na meet ung criteria. for example, dapat at least 2K pumapasok sa bank account mo every month. so, pinili ko NAB. walang charge kahit walang activity. though, i am not sure sa case mo kasi OZ passport holder ka. better email them.
4) as a matter of fact, kaka-register ko lang for medicare. sobrang bait ng staff nila. for efficiency, andito ung post ko about this:
http://pinoyau.info/discussion/723/coming-to-australia-soon/p7
5) as what @se29m said. kasama na dito ung studio.
6) not sure sa ibang visa categories, pero ung 189 walang show money. also since OZ citizen ka, mas lalong hindi ka na kelangan magpakita nito.
all the best!