Hi Barbara,
There is a French speaking school in Maroubra. If you look under "suburbs" on this website and type in "Maroubra" you will find information on schools.
Otherwise if you want a good international school there is one in Ultimo. It's called the International Grammar School
www.igssyd.nsw.edu.au/Ultimo is in the city so it may not suit your living plans.
I don't know that much about Maroubra but I think the Bay area is nice.
Otherwise, you can look at the private schools in Rose Bay or Vaucluse or Double Bay. All are very nice, expensive areas with plenty of good private and public schools.
Again, you can find out more about those schools on this website.