Tear down/wiring

[Guyz55]

I am in the process of dismantling ( to a a point) my 2nd series 55 3100 . I have removed the front clip,the old bed wood and the interior . I will be rewiring the truck at some point ...My question is ....do I need to retain and of the old wiring ...??? and when I start the wiring process , does anyone know any tricks to make the wiring process as neat and clean as possible . Any builds I could be pointed to that have good picas and directions

Thanx