Well, Im male, in choirs im more of a tenor 2 or baritone, and well I have a range of about D# 3 to Db 6 ...how could I expand my range using falsetto, and how do you get into the whistle range? what exactly is that? Would it even be possible for me with a naturally lower voice?

thank you

Sorry I meant to put D# 2 to Db 6