Ios 8 software download problem?

I have an ios8 download problem, so i've attempted to download ios8 on my iphone and its switched itself of and back on and on the screen its displayed i tunes so i've just realised you need to download it through itunes but i don't have an i tunes account on my computer. I've tried downloading itunes but my computer software dosent support it. Does anyone know how to slove this problem as my phone isn't turning on without my download of ios 8. Thanks for any help given x

Added (1). i tried to restart it but no luck unfortunately

When will my iphone 6 arrive?

I ordered an iphone 6 last sunday but not online. I called the company and placed an order through the phone. On tuesday they sent me an email to agree to the terms and conditions and I did it. Now when i check the status all it says is that it's preparing to ship. Has it not been sent? How long will it take to actually send it? And then after it does send, when will it arrive?

What should I do about my cracked iPhone 4s glass back?

I'm 13 and from the uk. I have 2 huge cracks on the back of my iPhone 4s and I need it repaired As soon as possible. The closest apple shop to me is in bluewater shopping centre. Will apple repair it for free? What would I have to pay if not? Will it take long? Will they not repair it at all?

Should I upgrade my iPhone 4 to a 5c or 5s?

I have had my iPhone 4 for a year and a half, I got it cheap on ebay an it works fine with nothing wrong. But I think the model is getting quite old now as it came out in 2010 and I want a phone which is lighter and has a bigger screen. I really like the iPhone's interface and I'm quite sceptical of buying a different brand as I might be disappointed with it. Is the 5c or 5s worth the money? And if so which one should I get? Thanks for your help.

Added (1). I know a few of you are very keen tech enthusiasts but I don't know why the 5s would be a tiny screen? I'm quite happy with the 3.7inch let alone 4inch! Also some of us don't just have £600 to spend on a phone (I only spent £320 on a new laptop) and contracts in the UK are more expensive than in the US so I'm on pay as you go.

Will using cellular data use up my credit?

I'm getting an iPhone 5 quite soon on pay as you go and don't want to waste credit. If I turn off cellular data then will my credit be only used for calls and texts? I'm happy with using just Wi-Fi.

Will Apple replace my iPhone 6?

I was told that the iPhone 6 was bendy, but when I tried to bend mine the screen cracked. I think it was defective. Will Apple replace it for free?