Will syncing my iphone on my new mac make me lose everything?

I just bought a macbook air and i have my family's pc desktop also. I want to put everything from my iphone music, contacts, etc.onto my macbook air without having it getting deleted. I want to be able to put songs from my air onto my iphone. In the end I want to put everything from my iphone into my Macbook airs itunes, without loading my whole family's library on it as well.

I dropped my iphone in the toilet - 4

I dropped my iphone in the toilet last night. It was fully submerged but for under five seconds. I then took off the rubber/protective covering, shook it a bit, dried it as best as I could with a towel, then stuck it in a sealed bag of rice.

I checked on it this morning after 12 hours in rice and almost everything seems to be working fine. Screen is okay if a bit slow. However the speakers aren't working. It vibrates but doesn't ring.

Is that permanent damage? Or should I keep it in rice a little longer? When can I start using it again safely? I love my iphone and desperately miss it and want to be patient so welcome all advice.

Is it safe to buy an iphone from cellphonecity.com?

I'm planning on buying an iphone from cellphonecity.com but the prices seem a little bit too good to be true. So I was wondering if you've ever bought an iphone or phone from this website and if it came in the mail or if you got ripped off or if they took your money and you never got the phone.

Why won't it let me download?

I have a iPhone 4S and I plugged my phone into a laptop to download pictures but it won't let me connect. How can I put pictures on my iPhone? Or get it connected to the laptop?

Will an Unlocked iPhone 5 work with Verizon?

I'm going to replace my iPhone 5 today at apple because of a lock button malfunction. If I were to sell the iPhone 5 that apple gives me today with the original packaging and everything that i had saved, would I then be able to buy a new Unlocked CDMA (if those even exist) iPhone 5 at apple, and use it with my current Verizon sim card?

The reason I'm selling and re buying an iPhone 5 is that I got bored of the black color, so I can get a white one instead, in case anyone was curious.

Please help though! I don't wanna sell my phone and then the white one I buy doesn't work.
Thanks

Added (1). I don't mean sell mine back to apple, I mean sell it personally and then buy the white one at apple with the money I earned from that sale.

Front of my IPhone screen is cracked?

I cracked it by not having a case on and it landed face-first on the concrete. Yes, I know, stupid idea not having my case on. I need to know the following:
- Is it hard to get your own screen and put it on yourself? How does that work?
- What are some good cases?
- And how's the cheapest way I can repair the front screen without having to do it myself? (if there's such a thing)

Carrier Editor Is not working on my iPhone 5?

As some of you all would have known, there's something known as Carrier Editor, a Mac or PC application which helps you to change your Carrier Logo without a jailbreak. It does not work for me on my iPhone 5, 6.1.4 and I'm not sure why. After uploading the logos into my phone, there's no change on my device.

Rogers my account app for iphone 4?

I have the Rogers My Account app for my iphone 4, but i'm a little confused. It says my balance is $280, but i haven't gone over my data, my minutes, my messaging, long distance, etc. I have 2 other iphones all linked together on one bill, so is the $280 for all 3 of the iphones? My bill can't be $280 for one phone…