Wow,
where to start? Seeing how you are in Italy I'm not certain how you should proceed? Typically what you do is....
If the Engine Light (CEL Light) comes on you get it scanned for codes, as the codes you get help to point you in given direction, so you are not fighting blind. In your case this does not appear to be an option so...
This is a SWAG, the central focus based on your descriptions is the steering column... lights, blinkers, instrument console all of which are wired in some way via or to the ignition switch.
My next SWAG would be the relays in the engine bay.
I hope this was somewhat helpful.
