Starter Motor

Hi!
I am new to this site.
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

Sounds like a stuffed ignition switch to me , you can get away with it if you can remember to return the key to the on position , it will pack it in completely one day in the not to distant future .