Oil ran out while driving..plug had came out. put oil & plug in & truck will not start. 2002 ford f250

We need more info, is it diesel ? does it crank?

It won't start? Will it crank with the starter but, won't start, or it won't even crank or turn with the starter. In either case, unless you got the engine shut down with in a few seconds, it's probable junk. Is it a Diesel? If it's a diesel they require oil pressure from the "high pressure pump" to fire the injectors. There's a reservoir for the "high pressure pump" on to of the engine in the very front. There's a plug with a "allen head" on it take that plug out and pour engine oil in the reservoir. You can fill it right up. If you need an engine got; car-parts.com, check the salvage yards in area for a used engine.

You ran the truck out of oil? If so then you have seized the engine up and it wont start again. If your lucky the engine could be rebuilt using the same block but the internals will all need to be replaced.