I would try the following.

1) remove the glow plug, put your finger over the exhaust and use your starter to spin the engine. Does fuel go to the carb and is the carb wet or fuel blowing out the plug hole? If yes, you have enough fuel.

2) Test the glow plug to make sure that it does glow. If yes, then you have a good igniter and plug.

3) Spin the engine with your finger off the exhaust and the plug out to dry the excess fuel. Install the glow plug, Open the carb barrel 1/4 the way and spin the engine with the starter. If fuel does not go to the carb, put your finger back over the exhaust.

4) Doing the above, will start the engine. If it doesn't, it is either flooded or ??????