Key stuck in the ignition? Sounds like the transmission back linkage is loose or out of adjustment, which means your steering column doesn't think you're in Park. And if the steering column doesn't think you're in park or neutral, it shouldn't allow you to start the car either. If you grab the lower section of the steering column right next to the dash, that collar should rotate when you shift the gear. Try to rotate it all the way to the left and then check the key to see if you can rotate the key to lock and remove the key. If it won't move, check to see if the backdrive linkage is mis-adjusted.
The backdrive linkage from the steering column in the engine bay on the driver side. You'll see the little arm sticking up out of the steering column with a rubber bushing in it. There's a rod in there that runs down to a linkage system to your transmission lever. There's a set screw (actually it's a bolt) that is at the end of the rod for adjustment. If this is missing or out of adjustment, the car thinks you're in gear and won't allow you to get the key out. Or shouldn't.
Is it a Cutlass Salon or 442 (which is based on the Salon)? V6 or V8? 4-speed automatic? Original condition generally? Or modified?
I agree with
airboatgreg in that if you're not a do-it-yourselfer, the charging systems can get tricky to solve the issues and you may need some professional help. Sometimes it's easy, other times it's a nightmare. But if you want to try, it's not impossible to do a few things yourself. You just don't want to get too far over your head and then can't get it back together. Believe me, I've been playing with G-bodies for years, and there are still some things I'm not too sure about.
The column bowl (the thing you need to grab and turn to the left) either allows the key to turn and operate the ignition switch or it does not. It's a physical block. Park or Neutral allows you to start the car. Any other position and it won't. Here's a cutaway of what's going on inside the column.