Explain kants doctrine of a good will your explanation

Question

Explain Kant's doctrine of a good will.  Your explanation should include:

(a) the distinction between a good in itself (i.e. intrinsic value) and a good for its consequences

(b) which kind of these goods is a good will

(c) how does a good will factor into the distinction between acting in accordance with duty and acting from duty

(d) how does a good will determine an action's moral worth