DHA will likely be your initial housing provider, rent is in bands and based on your rank. I won’t get into the weeds except to say you may consider them expensive compared to UK service residences. Trust me, you get what you pay for, compared to UK they are twice as big, twice as grand and the fault repair system is efficient. And…. there isn’t a council tax contribution equivalent either.
FYI, property prices in Australian major cities are going up at an insane rate. Add in, interest rates aren’t stable and long term fixed rates aren’t popular in Aus. Friends have seen their mortgages go up as much as $800 a month since 2020.
HPAS and DHOAS are available to help should you find a suitable property in your budget and are comfortable with the terms of the loan.