Overheating

I just bought this truck It's overheating, pegging the temperature gauge quickly. code said faulty coolant temperature sensor and misfire on cylinder #3. I have used radiator flush to clean out the system twice (just in case).I replaced the thermostat and replaced the coolant and restarted, the gauge pegged again quickly. next step coil pack and spark plug and coolant sensor. Not having any experience with this motor could you perhaps detail the procedure for plug and coil replacement and perhaps an exploded view of the sensor location? I have seen some diagrams that were so tiny and trying to show every sensor that it's all blurry. i'm try to do this on a tablet and my vision is not the best in any case. any help you can provide would be greatly appreciated.thank you so much.