There are four wires you will need to run from the back of your Start Button. It is easiest to remove your center console to do this as well as the panel under your steering wheel.
Wire #1 use 18Gauge and this wire needs to run to any 12 volt power when the ignition is on. This is also the power that will illuminate the light.
Wire #2 use 18Gauge and ground this wire.
Wire #3 use 12Gauge and splice into your ignition wire (so you can still start the car without the button)
Wire #4 is optional but it provides the anti-grind feature of Ignited Start Buttons so while the park brake is down and you're driving the button won't function and some fool can't push it and mess your shit up. Use 12Gauge and connect this wire to the emergency brake light power.
This info is basically specific to the Ignited Starter and not others although feel free to check out some others if you want eBay Item
Currently here is a link for the Ignited starter on eBay brand new for $49.99USD which is a great price. Ignited Starter on eBay
Most people put the button where the cig lighter currently goes but check out the DIN aluminum plate that I got, it comes in different colors and stuff.