First, how much do you know about electrical wiring (e.g., choosing the correct size wire based on the amperage draw and length of run)? Second, are you looking for a premade harness or will you put it together yourself? Third, are you asking more about concepts (e.g., the pros and cons of having a master power switch) or specifics (e.g., what type of switches to use)? In other words, be a little more specific in what you want to know.