[Damien]

What is your question? Are you having trouble getting the truck started or are you asking what the procedure is for starting an engine that has been sitting?

If you are asking about the procedure, You have already cranked the engine so the oil preeure should be up. Start the truck, let it warm up and change the oil and filter. Check the fluids, hoses, belts, etc.
If you are having trouble getting the engine to start, You need to check for fuel and spark. Look down the carb for fuel as you pump the accelerator. If you don't have any fuel sparying in the carb, check the lines and fuel pump. Make sure there is gas in the tank. My dad is good for not having gas in the tank.
You could have old gas, a mouse could have chewed a wire of fuel hose.