>Is this book a good introduction etc.It most certainly will give a shallow presentation of whatever ideas it is dealing with.
>Existentialism, Pragmatism, Stoicism, Utilitarianism, etc.If you can understand a book on philosophy at your current reading level, you won't be reading anything useful and will come out of it with a poor knowledge of the ideas therein.
If you're really serious about philosophy, you need to do the following:First, I would suggest you read Richard Rorty's essay "Philosopher as Expert"; it's an easy to read piece of metaphilosophy, on philosophy's relation to people who don't engage professionally with philosophy, and Rorty puts it very clearly how it is that one can be said to be engaging adequately with philosophy. I wish I had known about it when I first started studying philosophy. Rorty is also a "neo-pragmatist", so it will be in the tradition of pragmatism you're interested in.
If you've read that introduction and you're still interested in going deeper down the rabbit hole of philosophy, you'll need to read all of this if you want to get a thorough understanding of the long dialogue that is philosophy (I'm entirely serious):
Parmenides, "On Nature"
Zeno's Paradoxes
Plato: "The Trial of Socrates", "Crito", "Meno", "Euthyphro", Book One of the Republic
Aristotle:
Nicomachean Ethics,
The Categories,
The Metaphysics (these two are
extremely important for understanding all metaphysics after Aristotle)
The Hellenistics: The Epicureans, Cynics, Stoics, and Skeptics are all good fun but were schools with a lot of scattered texts, so it's hard for me to point out just one to read. Epictetus is a good place to start with the Stoics (
http://www.amazon.com/Discourses-Epictetus-Handbook-Fragments-Everymans/dp/0460873121/) and this is a good collection of Cynic works (www.amazon.com/Cynic-Philosophers-Diogenes-Penguin-Classics/dp/0141192224/). You'll need to look into the Epicureans and Skeptics further if you're interested in them; personally, I think you could skip the Epicureans and just read the Skeptics.
Medievals/Aristotelians: Their stuff on substance and accident is sufficient for understanding the Rationalists.
Rationalists: Descartes,
Meditations (very, very important book; Descartes is the fucking father of modern philosophy)(www.amazon.com/Discourse-Method-Meditations-First-Philosophy/dp/0872204200/), Spinoza,
Ethics(www.amazon.com/Ethics-Treatise-Emendation-Intellect-Selected/dp/0872201309/), Leibniz, (his essays should be fine) (www.amazon.com/Leibniz-Philosophical-Essays-Hackett-Classics/dp/0872200620/)
Empiricists: Locke,
An Essay Concerning Human Understanding (www.amazon.com/Essay-Concerning-Understanding-Penguin-Classics/dp/0140434828/), Berkeley,
A Treatise Concerning the Principles of Human Knowledge(www.amazon.com/Treatise-Concerning-Principles-Knowledge-Classics/dp/0915145391/), Hume,
An Enquiry Concerning Human Understanding (www.amazon.com/Enquiry-Concerning-Human-Understanding-Gentleman/dp/0872202291/),
An Enquiry Concerning the Principles of Morals(www.amazon.com/Enquiry-Concerning-Principles-Hackett-Classics/dp/0915145456/)
Utilitarianism: It's related to Empiricism, but I'm not all that familiar with the Utilitarians. Read Jeremy Bentham and J.S. Mill.
Immanuel Kant,
The Critique of Pure Reason(www.amazon.com/Critique-Pure-Reason-Second-Immanuel/dp/0230013384/),
The Critique of Practical Reason(www.amazon.com/Critique-Practical-Reason-Hackett-Classics/dp/0872206173/)