Redmi 1S TD-SCDMA/GSM how to change to English Miui?

Hi
I just bought a Redmi 1S TD-SCDMA/GSM in China. Although the language is changed to English, most of the apps are still Chinese and I cannot get the Google Play store to open. I believe I can change the entire software to an English one?

1) How do I do this? I have RTFF and I am unable to get an absolutely clear picture. This is my first time using Android.

2) Is it possible to upgrade this to Android 4.4?

Thanks

ppr