What do I need to buy an iPhone from T-Mobile?

I'm 19, I want to buy an iPhone 5s with the TMobile $60.00/month unlimited talk and text, 2.5GB of 4G LTE data plan. I don't have a credit card but I have the down payment for the phone and enough cash to pay for the 1st two bills.

My question is what do I need to bring to the store to buy my phone and get my plan? Do I need a credit card or can I just set it up where they just take the money out of my bank account? What paperwork do I need? Social Security card? ID?

What color Iphone 5s are you going to buy?

If you're not an iphone user DON't answer this. This is for people planning on getting the new iphone 5s. What color are you planning getting? White/Gold. White/Silver, Space Grey?

IPhone 5 Backup/ Photo to computer?

I broke my phone screen and have to have it sent off to my insurance who will either fix or replace my phone. The screen it pretty bad so i have the feeling it will be replaced.

I have backed up my iPhone on itunes but what will this save?
I want to keep my Messages, Contacts, Photos, Notes.everything really but i'm unsure what this backs up?
Also how do i remove my photos from my iPhone onto my computer?

Also where could i find my saves messages on my computer if they are backed up?

How to unlock iPhone 5 AT&T?

Anyone know how to unlcok an iPhone 5 from AT&T. I got mu phone from my brother but i want to stay with tmobile

Is the iPhone 5S Touch ID mandatory?

I'm a user of an iPhone 4S, and I can upgrade to iPhone 5S next year's July, but there's one thing stopping me.
Not the price or anything(I'm buying it sim free) But, the Touch ID sensor.
Is it mandatory?
I mean, the idea is neat, but if it's mandatory then it's a deal-breaker for me.