Idle air control Valve

Yes you would need to reset the light. Usually it is done with the scanner but if you do not have one, remove the fuse for the ECM or disconnect the battery ground cable and leave it disconnected for a couple of minutes.

If the light will not go out then that means you have a hard fault and proper diagnosis needs to be done. You could have a faulty throttle position sensor, blocked hoses, intake leaks? Whenever you scan a fault code, the code should not be really taken at face value. The code only gives you an idea as to what component is affected and start with some basic checks as to what other components would have a related affect to it? Like say an oxygen sensor code for example. On your vehicle the exhaust nuts are prone to coming loose so unmetered oxygen enters through the exhaust leak causing the oxygen sensor to give a different reading then what the mass air flow sensor sees so you would get an oxygen sensor code fault but the root cause of the fault was an exhaust leak. Same thing with your IAC fault. Proper diagnosis needs to be done to find the root cause of the fault.