ignition and clutch

1996 ford mustang gt (4.6) 120,654 mi. i have 2 questions: when i try to turn my car off the key will not do it. it feels like there is something stripped in the ingnition. the only way i can get it to turn off is to put it in the position over and over again until i feel a click when i turn it back. when i feel that click the car finally dies. next question: for awhile my car was hard to put in gear, it almost felt like the clutch wasnt engaging enough. but now it wont go in gear at all. i have adjusted the clutch cable, and there is a little tension when i press on the clutch but i wont let me go in gear at all when the car is started