I strongly recommend you attend a prelimenary class in philosophy, or peruse a thorough book on the various areas of philosophy, certain concepts like dualism and the self, and the logic involved. I also think you should get yourself a philosophy dictionary as a number of words have different meanings in philosophy than they do in general english (e.g.: the word absolute referring to innate ideas rather than perfection or completeness (though obviously they may still be perfect or complete)). I would also recommend that you first briefly study the various areas (logic, metaphysics, epistemology) before you progress to studying philosophers. When you do get to reading up on the philosophers, I would suggest that you do it chronologically, as later philosophers have built on previous works in many respects and this allows you to 'branch out' your understanding from one philosopher to another (e.g.: Plato to Aristotle, Descartes to Locke). Also to begin with as others have said I'd try to avoid primary texts, as not only may you not initally grasp it (might be lacking prereq. knowledge for example) but there is a lot of ground to cover and you can spend months reading up on just one philosopher if you're going by primary texts, you would be best doing this at a later time once you have a general understanding of philosophy.