honestly, at $50 AUD a day with a cold pixel, I'd keep it simple. One campaign, one ad set, three creatives max. At roughly $32 USD you just don't have enough daily volume to split things across ad sets and still give Meta enough signal per set to optimise properly.
i wouldn't bother with ASC yet. advantage+ shopping campaigns need purchase history to work well. On a cold pixel you're basically running broad targeting with extra steps, and you lose control over what Meta prioritises.
don't add retargeting either. At this budget your prospecting is your retargeting - Meta already serves ads back to people who engage or visit your site within the same audience pool. a separate retargeting ad set at $5 a day won't spend enough to learn anything.
start with ABO so each creative gets a fair test. Throw three creatives into one ad set at $50/day total, let them run 5-7 days, kill whatever isn't converting, then consolidate the winner into CBO when you're ready to scale. Test your creative strategy before you start messing with campaign structure.
what's your target CPA? With a $35-40 AUD AOV you need to hold under about $25-ish CPA to break even on first purchase. that number will determine how many creatives you can realistically test at once.
happy to take a look at your setup if you want a second opinion - free screenshare