Verify spark.
Remove a plug, keep it attached to the plug wire. Place the plug electrode near a good engine ground. Have a buddy crank the engine while you watch. You are looking for a strong, BLUE, snapping spark. Yellow/orange/white indicates a weak spark which may not be strong enough to start the engine.
If you have a weak spark, test your ignition coil. If you have no spark, the primary suspects would be the crankshaft position sensor and the ignition coil. In that order.
Good luck and keep us updated.