well first off you have to understand the difference between ethics and morals. MORALS refer to behaviour and ETHICS refers to the reasoning behind the behaviour.
you have to cover the ethics within Islam (or any tradition for that matter) of marriage, divorce, adultery, celibacy, sex, contraception, abortion and homosexuality.
i may have missed a few, but i think thats the main ones.
also, you should always include variation within the different schools, geographically (ie. wether they live in an Islamic state), culturally, or through time (which is good for showing Islam as a living religious system).
so study all those points and you should be able to mould an answer using the info you've learnt. i don't really know but i guess a question would probably just ask you to describe one or more of those areas with reference to variation, Islam as a living religion or maybe how they express the beliefs of Islam.
always remember to include textual references as well.
yep. hope that helped