Samml7

I have an '87 300TD Wagon and I am planning to upgrade all of the audio components, including head unit, speakers, wiring, but not putting in subwoofer. I was wondering if anyone has any experience working with audio in this car, or if they have any recommendations for speakers/head units. Finally, and most importantly, I was wondering if someon could walk me though/give me links on installing all of the parts.

Thanks,
Sam