Things I need to figure out now that I have an iPhone

As a twenty-two year old college grad, I have just purchased my first smart phone. I need some help figuring it out, though.
  1. How do I add songs from my iTunes?
  2. How do you turn off the camera noise without turning off your volume completely?
  3. How do you add/ use that little home screen dot that Miriam & Quinn have?
  4. How do I prevent that read receipt shit?
  5. Will people now expect me to answer their texts/DMs/tweets/etc?
  6. HOW IS THE BATTERY ALREADY ALMOST DEAD?