You obviously had a lot of old dried out oil in the plug causing the smoke, but it should have glowed a bright yellow if it had a good filament and enough juice in the igniter otherwise it won't start the engine.
What ever you do, don't settle for something just because it's cheap. A good purchase is ALWAYS a good purchase and cheap entry level gets thrown away along with the enjoyment of the hobby. Make sure you get a car that has good support as far as parts and upgrades or you'll just be trashing...
The shop dealing with planes and helis would be a good place to start. They would have the fuel line as well as the knowledge to tell you if you have a slipping one way bearing or another problem as far as starting.
Your post says it's a TG10. That's doubtful, so double check what it is.
It...