If you want to know what exactly you du, when you pick a menu visit the manual. 700 means throttle at lowest position and 2000 on the highest Position. it means the highest Signal the ESC can receive * You will hear the sounds which are described on the picture ( Source: Manual: ) The Hobbyking ESC's can receive a Signal between 7 us(microseconds). To come in this menu, which runs infinite btw you just have to do following Steps: * Connect your ESC * Configure the code (as much as ESC's you have and Pin-configuration) * You should hear nothing, because the Arduino sends a zero * Open your Serial Monitor and send '2000'.
You just don't have a language to program, but a menu made of sounds. ESC are programable like IC's or even your Arduino.