how can i fix my vauxhaul corsa?

started with orange light on dashboard engine electronics light then had to get a new key for immobilser light flashing new key sorted that then wouldnt start so someone who said they knew what they where doing looked at the wires to ignition now it wont even turn over when i put key in and turn to position one lights on dashboard come on when i turn any further lights go off and nothing else happens no clicking noise no nothing also had off the starter motor a wire had come off it it had like a clip at the end of the loose wire so soldered back on starter motor is sparking so i have been told but think i need a new one but more than anything need to sort out problem with ignition any help or advice would be really appreceiated thank you