Once the engine is turning,you need air, fuel and spark.

I assume you are trying to start the car on the earth, so air should not be a problem.
You can always grab an old (or brand new) spark plug, yank a plug wire off, plug the loose spark plug on it and maybe ground said spark plug to the block with vice grips - turn engine over - the the plug firing? If not, fix that!
THEN, if you have spark, have someone turn the key to "ON" - for only a few seconds, you should have 55 psi of fuel pressure. This can be measured at the little valve on the end of the fuel rail.

That's how I'd go about it. If you find you have low or now fuel pressure, or no spark at all, you can go from there.