The ignition switch under the steering column(above brake pedal area) will have a Red/Light blue stripe wire coming out, maybe 2 of them.
One will go to a connector just above clutch pedal or where clutch pedal would be if automatic, that red/lt blue wire will only have 12volts when key is turned all the way to START.
Thats the wire you want to connect to your starter relay, whether it is on the inner fender or on the starter motor(newer models)
Yes, you can remove all the vacuum hoses and solenoids from the engine bay.
They were for Carb, EGR, and EVAP systems