rationalskepticism.org

Tsuyoiko wrote:I'll suggest some works for each of the areas you mentioned, but you'll probably want to google for an overview of the ideas contained in them first, rather than jumping straight into the actual works.

Astreja wrote:ethics

On Liberty and Utilitarianism by John Stuart Mill
Anything by Peter Singer
The Socratic Dialogues
Modern Moral Philosophy by G Anscombe
Ethics Without Principles by Jonathan Dancy

Astreja wrote:epistemology

Problems of Philosophy by Bertrand Russell
Discourse on the Method by Rene Descartes
An Introduction to Contemporary Epistemology by Jonathan Dancy

Astreja wrote:logic

Organon by Aristotle
Concept Notation by Gottlob Frege
Principia Mathematica by Bertrand Russell and Alfred North Whitehead

With the exception of Aristotle and Frege, all shit.

Although UE's advice is solid on Sophie's World, I usually recommend people use wikipedia. There just isn't a proper general book on philosophy that isn't horribly biased one way or the other. From there, read primary works of authors - don't be afraid to read diagonal, skip chapters or not understand stuff. Go back later if you want more. Check out different authors, different viewpoints.