I'm afraid you may have to be a bit more specific about what you want to do.
If you have a circuit "ending" in an 8-bit ADC, does that imply that you don't need to use the Arduino in-built ADC? If so, fine, but do your read yours by a serial or parallel connection (Arduino could read either)?
Essentially all your code needs to do is read the ADC (internal or external) and send the value to the serial monitor. Reading 10 times a second is no trouble and overall it sounds like you only need a dozen lines of code. What that should be, however, depends on what you have and what you are trying to achieve.