Ok, !foodaustralia exists. Go make a post in it!

As to how to mod, it's pretty easy. Find a picture/icon you want to give it. Optional: Make up some rules or write up some sort of explanation for what the Community is for.

You can do this from a browser on your phone, but I don't think any of the apps have this feature. I recommend doing this from a large screen if possible. As for day-to-day modding, those requests are super rare. I get reports that any Aussie.zone user makes for any community in the fediverse (or any user at all makes for an aussie.zone post) and that amounts to maybe 2-3 spam posts per day. Usually for a kbin post. In short, you won't likely have any reports to worry about. I never get reports against local people.