0. A place to begin:
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"
on the Method of Rightly Conducting the Reason...
__________, Meditations on First Philosophy
Hume , An
Enquiry Concerning Human Understanding
Critique of Pure Reason (the N. K. Smith translation is available
on line, but the Pluhar translation has advantages)
Refutation of Idealism"
"In Defense of Common Sense" (perhaps)
Ludwig Wittgenstein, Tractatus
W.V.O. Quine, "Two
Dogmas of Empiricism"
_________, "Ontological Relativity"
Wilfrid Sellars, "Philosophy
and the Scientific Image of Man"
__________, "Being and Being Known"