Any seasoned writer will tell you that creating characters that are believable takes some work. It's a little like painting a picture, stroke by stroke. Characters have to be constructed, bit by bit, until the whole, complex individual finally comes into view.
Tips to Writing a Prologue
Not all novels have a prologue, and for good reason. A prologue can be a helpful tool when writing your novel, but it can also be harmful when used incorrectly. This podcast will help explain the prologue and whether you should use one.