Moving from iPhone 5 to 5s
So I am considering upgrading to the iPhone 5s. My 5 is running fine and there really isn't any compelling reason to upgrade except that I want to shift while my iPhone 5 still holds good resale value. Anyway, I have a few basic questions.
1) How do I transfer my apps, files, etc. from 5 to 5s?
2) Will my text messages, whatsapp messages be transferred as well?
3) I changed the region of my apple id from UK to the US few days ago. Since then all the new apps I purchased/downloaded do not show up in my iTunes. I only see the old ones which I had in my UK account. When I transfer my content, which apps will I be able to transfer to my iPhone 5s, the UK or the US ones?
Thanks in advance guys for your help. I am a bit worried about this and from past experiences using android phones I am not very fond of changing phones due to the hassle involved in transferring data.