Basically, it is ethics that got me interested in Objectivism. As a classical liberal and secularist, the moral heroes of "Atlas Shrugged" fit very neatly with my individualistic views. And considering the cultural volatility of our times, I have come to appreciate the power and necessity of objective ethics. Thus, and not to sound too layman, Objectivism is the closest approximation I can think of that philosophically appeals to me.
However, I recognize that Ayn Rand's ethics cannot be divorced from her epistemology and metaphysics (if I'm not mistaken). For me personally, there are several corresponding questions (e.g. regarding the matter of certainty of knowledge, limitations of human knowledge, concepts, determinism, free-will, etc.) that are not quite clear. This is mostly the insight I am seeking.
Ultimately, I hope to gain a more solid grounding of the fundamentals of Objectivism and see if that is a bridge I can cross from where I currently stand philosophically.
I hope that makes sense.