I have a 2002 Saturn SL2 with 138,000 miles. (4 cylinder DOHC with manual 5-speed trans). The car has always gotten around 38 mpg so it's been a great car for commuting to work (45 miles).
After the long 4th of July weekend, I started the car on Monday to go to work, and it just shook violently before I shut off the ignition (probably lasted 5 seconds before I shut it off). I checked the oil and noticed it was low. I drove the truck to work and picked up some oil on the way home. Then filled 1.5 quarts of oil to get up to "full" level. (I guess the rings are getting worn cuz it is using more oil now than it used to).

So, then I went to try starting it again and it will not start.
So, I'm wondering what my next step should be to diagnose the issue? I'm not much of a mechanic, but I can follow directions and check some things.
Any advice from you guys as to what to check would be great. For instance, should I just replace the plugs and wires (I don't think they've ever been replaced) and see if that fixes it? Or might that be wasting money because maybe the engine is toast?

(did I kill it by letting it get low on oil?)
Or should I drain the oil and see if there is anything in the bottom of the pan (like timing chain pieces)......

And if I decide I'm in over my head, does anyone have a mechanic in the Tumwater, Olympia, Centralia areas that might be good to work on this Saturn?