I’m new to nitro rc and I need help!?

Please tell me what does it mean to open the throttle, idle the engine, etc… Also, my glow starter has a needle on the top that is leaning to the red side of the gauge, what does that mean? Does it mean that it is not charged? Please give some tips to get me started. I already have the truck, it’s an XTM MONster MT RTR. Thank You !! Please answer as soon as possible!

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