ive never read any nietzsche where should i start. he's the most influential philosopher i think.
Twilight of the Idols was my first, and the penguin edition I had even framed it as a "lightning tour" through his thought.
You get some of his thoughts on societal decadence starting with Socrates, calling Socrates ugly; denouncements of egalitarianism as mediocre (people leaning on each other; absence of the "pathos of distance" that arises between the great/strong and the weak); history of how reality was rendered more and more abstract until we lost track of it, death of whatever role God played. There was some critique of morality, but I don't think he gets into the moral world order. He just points out the hypocrisy in how, in order to assert a moral judgment, one presupposes that they are above the system enough to see it clearly.
I haven't touch Zarathustra yet, but there was an excerpt from it at the end of Twilight, "The Hammer Speaks", about being as hard as a diamond, as opposed to everyone else being coal, brittle.