Welcome to the forums.
1) I am not sure as I don't use iTunes or a Mac.
2) Yes, you need a BlackBerry data plan to use the device as intended. Verizon will not sell a BlackBerry without this data plan.
3) No, it is unlimited data, texting is not included.
4) No, those apps use data.
The difference between stupidity and genius is that genius has its limits.
When you take things for granted, the things you are granted, get taken.
Even a mosquito doesn't get a pat on the back until it starts to work.
Too many people miss the silver lining because they're expecting gold.
[BES 5.0.3 / GroupWise 2012 HP2]