Hot plug will give you more stable idling.
But there are many reasons keeping the engine from starting. Such as low battery glow starter, rich bottom setting, engine flooded, idle too low...etc.

Since you found lots of oil coming out of the pipe, you can try this. Make sure the fuel is in the fuel line. Pinch the fuel line when you start the engine. If you can feel the engine wants to start, then, your bottom end setting is abit rich. you can either lean the bottom out of raise the idle.

Hope this helps.