Wanna be a pilot after my 12th?

hii..i am from west Bengal and studying under wbjee syllabus in cl 12th.i wanna become a penger plane pilot in future.where should i go to become a pilot ?? i am strong in English speaking and trying hard to be more perfect..after 12th may i have to atten some exam to study of being a pilot??there is an international airport "DUMDUM AIRPORT" just near my house ??what i have to do to become an pilot??