Wire in a 7 pin trailer hookup from scratch

[jhiggy94]

Hi guys,
Im a total noob when it comes to wiring but right now i am wiring up my 72 Chevy k20 with a kit that i bought. So im learning a lot but i still have no idea how to install any kind of trailer pin. So i want to install a 7 pin trailer hookup. There is nothing installed right now not even a 4 pin and i am completely unsure of where i have to start. Is there any kits that would help me? Do i have to run 7 new wires from somewhere up front? Any help would really be appreciated. Thanks guys