Big problem

[11:14]

Ok. so i have bought a xiaomi mi2s phone. i have it since yesterday and it works fine. great phone. i never owned an androig phone (smartphone) nor i had a phone with windows mobile for that matter. i am really noob when it comes to tricks and tips with smartphones.

i have some issues:

1. what do i need to install on it to have all in english. (the phone has english as a language but i still have some app icons with chinese).
2. from what i see everyone knows how to flash a rom and stuff like that. i don;t know how flash is done or what rom means... etc... i just want a tutorial where it is explained like for retard people.
3. when it comes to themes... how do i install them?
4. when it comes to ******* apps... with google apps and whatever... how do i find out how to download


i really need a link for begginers for this.

thanks.