wiring a stereo from scratch?

it looks like the entire car stereo system has been removed, speakers, head unit and even all the wiring behind the dash, the bit that plugs into the head unit is just not there! 8O

where do i start from to get one plummed back in?

cheers
Greg 8)

The min you can get away with is +12v, earth, aerial and speaker/s.

Eventually depending how much time and effort you want to spend you will need; constant +12v, switched +12v, light dimming, power aerial feed, aerial amp etc etc

Use something like this to decide which wires to tap into;

 http://installdr.com/Harnesses/VW-Wiring.pdf

use decent connectors (ie solder) and when I did the Cabrio I wired everything up to a modern ISO connector so that I can plug and play most radios from the last 20 years. Some of the speaker wires were different colours than those listed.

Note also that VW didn't stick to the ISO standard for the feed for the aerial and black wires are +ve not -ve like wot they were when you did physics are school!

All pretty straight forward if you are methodical and disconnect the battery before you start messing. Also a cheap ?10 multimeter is very helpful.