Check the carb. If it hasnt been run in a long time it could be clogged from old oil residue. You need to make sure the fuel is getting into the carb.
Check the radio box and make sure you have a battery installed and that it is fully charged. You can look for the switch while you are in there.
If you dont blow into the pressure tube with the carb open to prime the carb then you have to cover the exhaust pipe tip and use the roto start to turn the engine over to get the fuel to the carb.
Take the glow plug out and put the igniter on it to make sure it works. Then reinstall it.
Do you have any pictures of the truck? Im curious to see the condition its in