Q: Creating an Apple ID

you can create an apple ID from your iPhone, unless you have created already 5 apple ID with it (which is rare to do):

Set up an Apple ID in iTunes - Apple Support

iOS devices in Apple Store will have a special version of iOS, so probably not, but you can always try.

Probably, but unnecessary: Set up an Apple ID in iTunes - Apple Support

Same thing, basically. iCloud is a service associated with your AppleID. How many have you added to that phone since you got it?

Then you reached the 5 limit. you need indeed to create an iCloud ID from another device. Try the apple store ones

Contact iTunes support: https://getsupport.apple.com/Issues.action

Use the Account management section.

If you have a computer at home, you can use that to create them.

yes. It will work on you iPhone. If it doesn't work at the Apple Store, you need to ask someone who has an Apple device to create one for you.

What is not working if you attempt to create an Apple ID on a computer? Did you try the link that James provided? What happened when you tried?