When i was a kid i readed the collection " chair de poule" it is not so bad and it is pretty cheap and there a lot ^^

The first Harry potter was quite simple, plus if you have already read it or see the movie, it can helps you understanding the general background. I've read them in English and it's nice because the difficulty goes up with the story ^^

si une longe lettre, les trois mousquetaires, notre dame de fleur, le petit prince, le conte de monte...

little prince