Oily Green fluid leaking from my car? I don't know anything about cars, Help!?

this morning I moved my car and found a stream of tinted green fluid under the front of my car and I just got the car two and half weeks ago, it's an old car.It also makes a scary sound like metal against metal when I reverse and It also shakes violently when I drive on the freeway (steering wheel, seat, everything). I just added power steering fluid. I'm not sure if this is serious problem or not. It still runs pretty well. should I be concerned?
 
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