This is only my opinion, you'll have to actually try and ask around if you want to try your chance with France.
I think France will be hard if you only speak english, unless you find a touristic place (in Paris for example) where they are looking for international waiters.
if not, people/clients will not speak english with you, and it'll be hard at first to take the orders if you have a language barrier. Not even talking about the every day life too (finding a place to live, shopping, insurance, communication in general, etc.)
Generally speaking, French people are rarely speaking another language. Even young people who learned english at school, they are not very good at it, and they won't make the effort to even try.
Of course there are people like me too
happy to communicate in english with strangers is they prefer.
Also, in order to be allowed to work, you'll need an European working schengen visa (ask the French embassy in Australia before coming to Europe), or once in France you can ask for a residency card with work privilege (in France, at each administrative department's prefecture, but the procedure takes MONTHS, if not years...). You better ask the embassy, don't do it while already in France.
These can be restricted to specific jobs, and delivered for a specific time length. (3months, 1 year multiple times, until you can get the one for 10 years).
it's the future job's employer who need to initiate the request and publish job search notices, so you might be able to find these and see who is searching for Waiters. I don't know where to look, the embassy will probably have more information.
There is also a "work holiday visa", which is an agreement between countries to allow working, but age limit is 30. Though, Australia seems to have restrictions. (I don't know why, France/Australia were partner with this kind of visa last time I heard about it, not anymore?)