Beginner needs help changing language/firmware

I've been lurking around, looking for methods to change the language of my w890i. I'm moving to China in June, and my mobile unfortunatly doesn't support the language, and last time i was there, calling/texting wouldn't work either. So i suppose i'll have to install a Chinese Firmware. I've checked the download section and downloaded a few firmwares (not custom ones), read a few tutorials (A2 being some) but i'm still quite confused. Is anyone kind enough to post me a few good beginner tutorials? From scratch to start. I'm only intrested in making my mobile being able to type English & Chinese and call in China.

Thanks.