Where should I begin with that tremendous wealth of the French Literature.
Well, you could find many but I suggest some of the above:
- Stendhal, La Chartreuse de Parma
- Bonjour Tristesse, Francoise Sagan
- Everything of Collete
- Books of Duras
- L' Etranger, Albert Camus
- Marquerite Yourcenar, Memoires d' Hadrien
-Madam Bovary or L' education sentimental by Flaubert
- A la recherche du temps perdu, Marcel Proust
Then you can try with philosophers such Sartre or his mate Simone de Beauvoir who wrote The second sex. Of course there are many others except them. But it is a good start.
Regarding the poetry you can try Ronsard, La fontaine (although they are of a very earlier period) and surrealists. Arthur Rimbaud is fine.
There are also the classics such Moliere, Edmond Rostand with Cyrano de Bergerac, Dumas and Balzac.
Very interesting are also Raymond Queneau and Blaise Pascal.
But in anyway don't forget Asterix and Ovelix and the Little Prince as it has been mentioned before.
Cheers,