This is all 7 books, starts in on page one and ends at the end (e.g. no introduction, glossary, etc., which is OK. They put it chronologically (magician's nephew, followed by the Lion, Witch, Wardrobe) which is supposedly how CS Lewis in his later years suggested that they be written, but that takes some of the mystery out of book 1. I suppose it's like reading Genesis before the Gospels.
We love these stories. They are great adventure stories, but also have layers of Truth in them that I continue to discover each time I read them. I particularly have learned about the nature of Christ and heaven from these stories.