@MLBS You're coming for studies right? Bring original and photocopies of your travel documents (passport, AU visa, eCOE/enrollment docs). Avoid bringing meat/fresh fruits/plane food (if you're buying food before riding the plane; stick to pastries/bread and try to finish them before disembarking). AU is super serious about prohibited food/items entering their country. Even before checking in for your flight, your suitcases will be scanned with those security wands that checks for drugs (it even detected that I had over-the-counter meds--antihistamine mostly). So make sure you remember what you've brought, especially the commercially-packaged foods and cash, and don't forget to declare them! When in doubt, just tick 'yes' on the customs card.
I recommend doing research on household/personal items that might be cheaper to buy in Manila (like travel adapters for your tech gadgets!). They have Target, KMart, and big supermarkets like Coles and Woolworths that have relatively affordable household/kitchen items, so you can just buy those items when you get here (although in my case I brought my well-loved winter blanket with me to AU instead of buying a new one in IKEA because it was more economical for me).
If you're not sure yet which mobile/telco provider you want to use, you can just pick up a prepaid SIM (like Aldi mobile, Belong, Amaysim, etc) from the grocery store so you have an AU number (take note that you still have to activate the sim before you can use it) that you might need for banking. Get your bank cards sorted out as soon as you arrive, because they could take time to arrive.