Sophie's World is a good beginner's introduction, but please do realize that philosophy is so broad that no single book can be considered the "holy bible" of the subject. Furthermore, it's worth differentiating between Western philosophy and Eastern philosophy. Sophie's World serves as an introduction to Western philosophy only.

That's very inaccurate. Or else you have a very different concept of what the word "philosophy" means. I believe I speak for the rest of the people who have posted in this thread when I say that we use the word "philosophy" to refer to it as an academic discipline. You seem to use it in a sense of "personal philosophy", as in personal attitudes towards life and the world. Please know what you want.

Academically, Western philosophy is drastically different from Eastern philosophy. You could say that Western philosophy is the precursor of science and is still based on reason and logical arguments. Eastern philosophy however is very spiritual and is actually categorized in many Western academic departments as a branch of religion.