How are the reason, freedom, and morality related in the thought of Kant?

How are the reason, freedom, and morality related in the thought of Kant? ( refer to some or all) of the following: good will, a priori principles, " from duty"v. " in accordance with duty," imperatives, autonomy, kingdom of ends. The only source should be from the book: Grounding for the Metaphysics of Moral ( Immanuel Kant )