New To Xiaomi And Miui

[srkonus]

Hi,

i will be New to Xiaomi and Miui because i will buy the Note4 with LTE base 20 this summer (i think i will buy at Honorbuy).
At this time i use a Jiayu G4S. I want to flash the xiaomi.EU ROM but i am scary to flash. So is somebody Herr who life in Aachen (Germany) who can hell me?
What are the first tasks to do in Miui? How easy is the system, dies xiaomi.EU Rom gets OTA updates?

Sorry for my english and the Niob questions,

rhanks for your answers

Srkonus