Ignition/Electrical Problems with my 96 Mercury Cougar Plz H

Ok, so i've got a 1996 Mercury Cougar that I just put a Ignition Interlock Device in. My ignition lock broke and i've been using a screwdriver to turn the car on or at least trying to turn it on. Yesterday morning I try to turn the ignition so i can get the broken tumbler out and replace it, i turn it to the on position and the dash lights come on. after a little bit they go out, along with the door locks, i can't turn the head lights on or anything. when i do turn the head lights to on they don't come on but my IID unit turns OFF not on but OFF and there is a weird noise that is coming from my trunk or the back of the car which idk what it would be. When i turn the headlights to OFF the IID unit comes ON. I have a broken tumbler and idk what the electrical problem is. What should I do? Should I call a locksmith and have him fix the tumbler then call the IID unit tech and have him come look at that or take the car to auto repair shop and have them look at the whole thing and see whats up? i dont wanna spend a lot of money and need to know what to do. Any help at all would be very appreciated! Thank you! SkysunCar Repair Talk's forum.