As'salaamu'alaikum Wa Rahmatulaihi Wa Barakatuhu,
The following are summaries of the book Faith, Al Iman: It's Pillars, True Meaning, and Nullification by Muhammad Na'im, Yassin. They answer questions, and explain faith in Islam.
Part 1
The Belief in the Angels (Unseen), Books, and Prophets
The Belief in The Day of Judgement and Divine Decree
Part 2