Starter Motor

Today I drove (1/2 mile) and had my car in park position for 5 minutes, with the key in the starter motor position. I realized there was a problem when I heard my car make a siren type sound and other strange noises and when I turned it off it smelled burning a bit. When I tried turning it on it wouldn't ignite until I jump started it. Thanks to the guy that jump started my car he told me that my key got stuck in the starter motor position. I have my Range rover 89' parked and I am afraid to start it again. I spent my life savings on a new engine 6 months ago and I am afraid to spend another bundle again. I am a girl that is learning about cars and would like some advise so I don't get the run around from a mechanic.
Thanks!
jessica

I would start off by checking all the fluids if you have not yet power steering, and oil. dosent sound like a stuck starter have you ran the truck sence?