Develop your characters by placing them in a situation where they are faced with a challenge. For conflict inspiration, look no further than these classic moral dilemmas (and, of course, analyze them from the perspective of your character). For an example of a moral dilemma, search "The Trolly Problem."
What does your character want most? Now consider what he needs most. Is what he wants preventing him from gaining what he needs? Or will he have to find what he wants before he can achieve what he needs?