Wiring fog lights is easy, just don't forget to use a relay and fuses before and after the relay.
you have a few options as to how you want to wire them. I like to wire them so they are either on or off with a switch when the key is on.. so
install relay under the hood, and run from the positive terminal of the battery to the relay with 10 gauge. install a fuse in this wire.
then run from the relay out to the lights. also use 10 gauge and a fuse.
now go to the fuse box, and find a fuse that is on with the key, and run a smaller gauge wire (14 or 16 even) from there to your switch, then from your switch to the relay.
Thats it, done.
You could also run the power source for the switch from the headlights (either high or low beam, you choice of when you want them to be on)
Don't forget to use grommets if you are going to pass a wire through a hole you drill in metal.