Help...Wiring Hella 500 Black Magic Lights

So I looked at a ton of threads and then looked at the instructions that came with the lights but I still have a few questions. I understand what the wires do but where do I hook them up. Coming out of the lights are the black positive and the blue negative I know to ground the blue and the red is the power that goes to the battery. Where does the yellow relay wire go to? Then there is the green wire for the switch but what are the 3 terminals on the switch for? where should i ground my wires? What fuse should i use with the switch? What is the green wire for?