There is a set cold read that you can just say to people, it's the classic cold read and it applies to most people as it really just describes the human condition. I'm sure you can find it on google.
However, the real key to actual cold reading, where you actually can predict things about people without knowing them for long, is experience. You need to understand yourself, and you need to talk to lots of people and dig into their fears and anxieties, find out what makes them tick.
This is extremely useful for calibration and forming deep connections with people, and eventually for 'seeing the social matrix'. Other cold reading stuff is just a trick and it will inevitably backfire in the end.
In summary, talk to lots of people, and really take an interest in their lives. Pretty soon you'll be naturally cold reading people all over the place.
Best of luck!!!