How can I get a killer flat stomach and less than two monthes?

I’m 5’5” and weigh 145 pounds. I don’t care what I weigh I just want an amazing looking stomach and an amazing body to go with it before school starts. I’m starting my diet tomorrow. What do I do to get an an amazing body in less han two months (what exercises and what to eat)? How to I stay motivated to keep up with it?