Need help with essay on Kant

This is the topic of my essay:
Topic: Evaluate Kant’s thesis that actions lack moral value unless they are performed with a good will or form the motive of duty or respect for the moral law. (Be sure to explain exactly what you think Kant means by this.) Would you say that Kant is right?

Can anyone tell me what kinda things I should include in the essay. Like the format etc. Also I am suppose to state an objection and a response to the objection.

Your help would be greatly appreciated. Thank you^^