I've found most cars are pretty similar to wire..
You have your basic stuff to take care of first in
Starter motor - in the ae86 gts it is straight from the key barrell without a relay
Fuel Pump - Look for the open circuit relay guide
Injector Coil and Ingitor Power - Powered from the Main Engine relay
Air conditioning - Are you going to bother with it?
Guages - Water Temp , Tacho / Rev counter, Reverse Lights , Alternator - Take it from the