I've got my arduino to communicate with a Sony PS2 and I have an LED setup on my breadboard such that when I press the right arrow button, the LED turns on. When I press the left arrow button the LED turns off. My question is, now I want to control a light and motor with the PS2. I'm not a circuits person. Can anyone give me some help with designing a circuit that uses a battery to power a light and a motor instead of powering it with the Arduino board?
Thanks
You shouldn't be powering a motor from the Arduino anyway.
You need to provide more than a description, you need to provide details of the devices
you mention - what light? what motor? For how long? What duty-cycles?
My apologies, I should have been more specific. I want to power two, 20 watt floodlights. The bulb type is MR16. While I haven't made the final decision of what motors to use I have a QH4-4350 motor from a computer printer that I've been tinkering with.
I want to power two, 20 watt floodlights.
What voltage, AC or DC?
DC
It's like pulling teeth!
What voltage?
Where is the Web link for the lights?
What batteries? Web link to specifications?
Where is the Web link to specifications for the motors?
Do you expect others to do all the research?
Maybe he has false teeth?? 
The arduino itself can only handle about 20 ma per pin safely. Anything over that and you need to provide some sort of interface (relay, transistor, ???). You need to be specific on the ratings of what you are working with.