Current Needed

I’m using the vex kit to build a robot powered by a hydrogen fuel cell. What are the minimum amps required x 7.2 volts to power the motor, servos, sensors, wireless camera?

There is no definite answer here. Your current will vary depending on your load configuration. Each time you add a load (a motor, servo, sensor, etc…) your minimum current requirements will change. Your current requirements will also change depending on the work being done by the load at a specific instance; that is, a motor that is free spinning will require much less current than a stalled motor.