White or amber and you usually won't have trouble with the law, since those are the only color of lights permitted to be on the front of a vehicle in most places. If you pick up those LED strip kits, the wiring is always very simple. There will be a positive wire with a switch on it, that goes to +12v power, it is usually red. There will be a negative wire, usually black, that you attach to any ground, such as part of the body or frame where you can get continuity to ground. That means basically anywhere you can touch bare metal with the wire or the screw that you have the wire secured to. You can also hook it directly to the negative terminal on the battery.
Lots of guys have them wired so they come on with their marker lights. For that, just buy a fuse tap, and find which fuse is for your marker lights. Then you can run your switch directly to the fuse tap, or, if you want to live dangerously with the law, you can tap directly into the wiring for the marker lights on the front of the truck and have it on all the time when the marker lights are on.... but, you should still have some kinda switch in case you want to shut it off.
Also, like BrianDye suggested, go with LEDs. They last longer, plus power consumption is WAY lower.
