Hi car people!

My car died the other day, in the middle of the freeway. From what I can gather, she overheated pretty badly. Although, I had no warning of this - my temp needle didn't move from normal, I have no oil indicator light come on, no water indicator light come on, and I had topped up about 2-3 weeks ago.
Anyway, travelling down Monash Fwy and it all of a sudden feels really sluggish, then I lose acceleration altogether, as I am pulling off, masses of smoke. Yay for my car!! LOL
Once I stopped, the smoke stopped, temp needle snapped all the way up then all the way down in about 1 second, then back to normal. I let it sit for a minute, the smoke didn't come back, then I turned it off.

Tow truck man said when he put it on the truck (about an hour later) there was a huge oil puddle.

Anyway, it won't start now, but my question is, is it a good sign, a bad sign or a nothing sign, that it is still making noise? It is still *trying* to start when I turn the key, it just isn't. I mean, if it were reeeeally screwed, it wouldn't make any noise, would it?

I am having it towed to the mechanic next week and really just trying to brace myself as to ho bad the damage is firstly from it overheating and secondly of course as to why it did it with no warning in the first place.

Any ideas? TIA!