I am a Bengalee. I am from the state of West Bengal in India. I don't know Arabic. So I want to read Quran in Bengali. Should I read it in Bengali?
yes, you can. However, it is better to read in Arabic.
You could also read Arabic by:
getting a Bengali transliteration Quran.
the other alternative is to make sure you get a quran that has both Arabic AND Bengali in it. That way, every time you read, you will be seeing Arabic, and will start recognising letters.
you should also learn how to read Arabic. you can use videos on youtube. eg http://www.youtube.com/user/maazrah?feature=watch and http://www.youtube.com/user/LearnTajweed?feature=watch