Adding Fogs to the Ride

[mido]

I was thinking of purchasing some fogs off of ebay for 70 bucks... From what ive read, i basically have to get under the car, remove the fog light plate holder thats in there now, and put the fogs in place then plug them in. When i plug them in, will they bit lit or do i have to wire a switch? After i did my HID install i got rid of the Day time Running Lights, so if there would run all the time, then there would be no need for me to wire the swtich up. But, if there is a tutorial that someone could pass on, on how to wire it that would me great. I found a tutorial on mz3 forums but the wiriing diagram was not clear at all..
Thanks all