Question [Q]Some questions about flash stock firmware! Please help!

Hi friends!

I want to ask three questions ?
I have CWM recovery on my T211 and I have stock Firmware(.zip) of my T211,It's original of my device that I find this by my ROM serial number (T211XXAMK7) by searching on google from SAMSUNG updates _from XSG region_now I want ask...

-Can I flash stock Firmware via CWM? if it is possible,how can I that or what should I do?(which items wipe or none)
-Is it possible to remove my info in setting>about ..as IMEI or base band or build number after flash firmware?
-After flash stock firmware,my custom kernel (blackhawk) will change to stock kernel?(I need my stock kernel)

thanks.