Sorry to hear you having such headaches with the connectivity, I wish I could help but i have never used Nikon, and also I never send photos to my phone from the camera, I upload them onto my computer

As for learning the camera, I would suggest you take it slowly do not try to learn everything at once or it will only confuse the heck out of you

I would say first start using the auto Mode and have fun with it, and then when you have time read up a little about Aperture and priority modes, there the next step, and dont even think of manual shooting for a while yet