what can the reader expect in a story told from first-person point of view

In general the reader can expect the character, usually the protagonist but not always, to share their thoughts and feelings with the reader. First person narrators usually give their unique insight into themselves and the world they live in. Often the reader can become rather attached to the first person narrator. Sometimes the reader must decide if their first person narrator is reliable or not. In any case the reader is privy to one point of view.