0. A place to begin:
"Philosophy
Pages" - a web-site by Garth Kemerling. You'll find links
to many resources here: encyclopedias, timelines, other philosophy
sites, etexts, a "generic study guide for students of philosophy"
...
René
Descartes, Discourse
on the Method of Rightly Conducting the Reason...
__________, Meditations on First Philosophy
David
Hume , An
Enquiry Concerning Human Understanding
Immanuel
Kant, The
Critique of Pure Reason (the N. K. Smith translation is available
on line, but the Pluhar translation has advantages)
G.E.
Moore, "The
Refutation of Idealism"
________,
"In Defense of Common Sense" (perhaps)
Ludwig Wittgenstein, Tractatus
Logico-Philosophicus
W.V.O. Quine, "Two
Dogmas of Empiricism"
_________, "Ontological Relativity"
Wilfrid Sellars, "Philosophy
and the Scientific Image of Man"
__________, "Being and Being Known"