Wiring for future audio

[Zebb]

Soon I will be putting my cab back on my chassis and will be wiring it. While I am doing this I wanted to run the proper wiring for stereo components installed at the end of the build. Can you guys point me in the right direction as far as what I will need? It would be much easier now then after everything is together.

This is what it will be.
86 reg cab
DIN head unit in the dash
Probably only 1 sub behind the seat but should plan on two
Amp either under seat or behind seat
6X9's in the corners
2 front speaker not sure if in the kick panels or factory location yet

I know this is not much info without having the components yet. I just didn't want to have too small of a wire somewhere or stuff routed wrong. I want to save the stereo research for the end but thought I could get the basic wiring in the cab and ready for when that time comes. Is this even possible without knowing specifics about each component?

Thanks