White smoke is a lean condition on a diesel, it doesn't have either enough fuel yet OR it is low on compression , this could be from sitting so long. To get through this you need to CRANK THAT BAD BOY AS FAST AS IT IS POSSIBLE !! Pulling it if its a standard shift would work. Once started it needs to run and get hot , then it should come back to life , if it doesn't a few more trys with an oil change to a good thin oil may help.
Also Don't think it will start on the compression release.... only use it as a cranking aid , get it cranking, while cranking ,close the release so the engine is back to full compression and keep cranking!
It may need you to crank through it trying to start the first time.
Fuel at the injectors during cranking should just be little squirts if only looseened, if removed completely will be dribbles. Also have this thing at at least half throttle to full . My little booger Yanny did the same ething as yours when I first got it , I towed the little stinker down the driveway (over 300' long) a few times and finally got it to go, let it warm up and it has never failed since.