A good introduction to Nietzsche, and also existentialism, is Irrational Man, you can find it at any book store
I have The Portable Nietzsche translated by Walter Kaufmann. I think the translations are very high class
Of course, Nietzsche is a poet above all, so reading Introductions into his works wont really give you the feel for him
but they help inthe beginning
Enjoy your investigation!
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