Welcome to Just Commodores, a site specifically designed for all people who share the same passion as yourself.
I just hooked mine up to the electric windows under the switches, that way when you turn the car off and get out they stay on for like 40 seconds untill the window realy drops out so looks good when you stop and jump out.
Before cutting any old wire check the current draw of the item you wish to install . wiring them into a circuit that was designed for so much current load and is fused to that load only you could in the end overload the circuit burning out fuses and wiring in the end . use a relay to control load and current draw . if unsure consult a auto elec for wiring tips