Make sure that when you prime the engine (full throttle, thumb over air intake, spinning the prop) there's fuel sucked up through the fuel lines.
When the fuel reaches the carb, you shold spin the prop 3-4 times by using the "prime" technique, then you're ready to close air intake to idle and connect the power to the glow plug.

Make sure the glow plug works by removing it from the cylinder and testing it with your power source.
The coil in the plug should glow bright orange.

Watch your fingers and ALWAYS make sure you have the air intake in idle position before attaching glow power and starting the engine.
If you forget the throttle at full power and you start the engine you might panic and put your fingers in the propellor, or the plane jumps up and bite you... just be careful. it's not a toy!