You still need to narrow down your implementation however: if you want something to interact with, then try to make a brain class that responds to certain input automatically (as a start), and study AI.
If you want to simulate life, then bust out the medical encyclopedia and start reading. You'll need to polish up on your knowledge of how the human body works before you try anything smart. I would start by giving the "person" a stomach, heart, and lungs. Make sure it can go to the bathroom.