Nietzsche and his theory on the origins of Morality

Much of my reply to your question of WTP applies to this as well. Since Kaufmann, all of N's works are available in adequate translations, and there is a large number of secondary sources to aid in interpreting his thinking. If you are interested in a quick overview, you could consult the Stanford Encyclopedia of Philosophy (online).
Rather than ask a general question which by its very nature would elicit not very useful responses, it might be preferable to read The Genealogy of Morals and then ask more specific questions about his position that morality as a human phenomena can be explained by healthy and unhealthy (these seem to be used in a normative sense at times in his works) manifestations of the WTP.

Beyond Good and Evil would be a useful read for this topic, too.

I suspect that esthlos wants us to do all the reading.

Good point, Joe . . . i'll get right on that . . . tell the boy to hold his breath, i'll be right back.

I suspect that someone wants his/her homework questions answered without having to do the work!

homework questions? here? I have never seen it before

It is a common ploy here, sad to say.