How to sync iphone to new computer?

I have a macbook and just got the macbook air. I'm going to be using the macbook air as my main computer but i sync my iPad and iPhone the the old macbook. All their backed up files are on the macbook. How can i sync my iPhone to the macbook air and make a new backup of what's on the iPhone right now to the macbook air. I already used migration assistant.

Will my text messages still be on my iPhone?

Thursday, the power button on my iPhone 4S completely broke. It was not dropped or anything, just broke randomly. I ended up using the assistant touch thing, and going to device and tapping lock screen. I was playing around with assistant touch and accidentally hit 3 finger gestures. I couldn't even touch my phone. I took it to AT&T Saturday and they told me it wou, d have to be sent to apple, and that I will get a brand new iPhone Wednesday. I know I probably have quite a few text messages, and I'm just wondering if they will be there when I get it back? I'm pretty sure it will be just like having a brand new iPhone, no numbers or anything. I know I cold use icloud, but I never use Wi-Fi so I don't know if it backs it up and it wasn't backed up to iTunes. So will I be able to see my text messages?

Otterbox Defender, Impact, or Commuter?

I'm in need of an Otterbox for my iPhone 3gs. I don't know which to order… The Defender, the Impact, or the Commuter. What is your advice for the best one? Ordering online is hard since I can't hold them in my hand. My friend had the Defender whichi s pretty bulky, but I didn't know if the other two would give as good of protection. Thoughts?

Hard Cases Vs Silicone Cases?

Which Is better?
I have an iPhone 4s and have TONS of cases. Both hard and silicone ( rubber ) ones.

Both have their pros and cons.

But!
Which is better for protection?

Switching from 3G to 4G, Internet not working.iPhone 4S?

I had an iPhone 3G with Rogers pay-as-you-go plan then I recently upgraded to a 4S. My data plan seems to work fine with making calls and texting, but the Internet won't work at all, just says it can't connect? Do I maybe need some sort of 4G plan?

How to get All my songs to sync to my iphone?

I just bought an iPhone 4 and I noticed that a nice chunk of my songs weren't syncing from iTunes, they just turned grey with a syncing symbol next to them. I have the manually add song box checked, I have enough memory I've tried removing some songs and I can't figure out why they won't add. Any suggestions?