Welcome to the fourm.
VDHG or VGS/VAS combo (optionally VGE with the latter)
First is simpler and stops you from tinkering (ie screwing it up), second is slightly cheaper and more tax efficient in draw down phase.
VTS/VEU combo would replace the VGS/VGE combo (weird to mix and match from the former with the latter) - they are cheaper but they are US domiciled so most avoid them and stick with VGS/VGE.
https://www.bogleheads.org/wiki/Non-US_investor%27s_guide_to_navigating_US_tax_trapshttps://www.bogleheads.org/wiki/Outline_of_Non-US_domicileshttps://www.bogleheads.org/wiki/Nonresident_alien%27s_ETF_domicile_decision_tableThere is no "ideal" ratio of Aus vs Int.
More Aus means more franking credits no currency risk but more concentration risk.
More International means less franking credits, more currency risk, but more diversification.
With such a small amount of money relative to what your retirement goal would be, you could keep it simple at 50/50, but as it grows hopefully you come to realise that 50% in the highly concentrated Australian market is a lot of idiosyncratic country risk. I think 20-30% seems more reasonable. VDHG Vanguard thinks 40% (which is what the diversified funds have), but each to their own.
This link should help with how often to buy.
With 1.2k/month, I would guess every 3 months is about right.
Unhedged is a comment on currency risk.
Again like there is no "ideal", just different risks to trade off each other.
In general, it is less of an issue -
1. When you have property in Australia
2. Have fixed income or cash in AUD
3. Have a lot of human capital (time to earn until retirement) in AUD.
So if you are nearing retirement, renting (own no property), and have a relatively low fixed income allocation, then it is more of a concern, otherwise not much of an issue.
Hopefully deborah drops by to give you some answers to the questions you were not aware you should ask, such as order of investments, emergency fund, super, etc. Or else you can looks through past posts in this thread and probably will find some good info.