A handy tool for cranking the engine is a remote starter. It is simply a wired switch used to apply 12 volts to the starter solenoid input to engage the starter. This allows you to watch under the hood while you crank the engine. Before adding fuel, you will probably want to simply turn over the engine a few times, listening for any strange noises. You can also purge the cylinders of oil before replacing the spark plugs. This process will also help turn the oil pump and prelube the engine before firing with fuel. In some cases you can watch the oil pressure gauge to see if pressure is building in the engine.