OK, you are in fairly good shape (maybe) the headlights turn on by rotating the stalk on the left hand side of the wheel. rotate it one 'notch' for parking lights two for headlights, pull it back to dip, it rotates towards the front of the car IIRC.
Centerline Alfa is very hip to these cars and I have had good luck with them over the years, fairly reasonably priced parts too.
Somewhere I have an '80 spider wiring diagram but a meaningful scan will be too big to post here so if you have an address to send it, let me know and I will try to ferret it out tomorrow.
When you turn on the ignition you should hear a whirring from the fuel pump, it should buzz for a few seconds, then sound like it has taken up a load, if this happens then you have fuel pressure!(and this system takes a LOT, like the BMW Tii Kugelfisher) If so, floor it, and spin the engine briefly, then return to the idle position and crank - it should sputter pop or something. If it just spins look to the spark. You MIGHT have Marelli pointless ign, but might be Bosch.
Once you get these cars right they are (contrary to CW) pretty bullet proof (as Italian cars go);-).
Cheers!
Dave G.