There is an instructable on using the QT113 here: http://www.instructables.com/id/DIY-Touch-Sensor/
That example does not use the arduino but you can connect the QT113 output to a digital input on the arduino and it should work fine. You can use the arduino digital switch example sketch to test that its working, just connect up the QT113 output instead of the switch and resistor.
Once you can light up the arduino led using the sensor, you can look at adding a call to delay() for however many milliseconds you want and then turn the led off.
The last step is to replace the led with something like a relay to turn the bulb on and off. There are arduino tutorials that explain how to do that but my suggestion is to get everything else working as you want before connecting anything up to 220 volts