96 Mustang Gt V8 5 SPEED

I just recently bought the car an the ower said the anit theft module went out but we wasn't for sure. When you start the car it seems to run in a limp mode. An the head lights, turn signal or nothing inside the car works. Radio works. But thats cause its hooked straight to the battery. The break lights work correctly. That know of. But if you turn the hazards on all lights will flash. But thats the only time they'll work. All gauges on the dash work besides the mph but I thnks its nothing big. But I just need to know what I can do about it or what I need to fix it?