Is it okay to write down my password?
It is not recommended. Passwords that are written down can easily be stolen. While you receive a new password, you may wish to write down your password until you have the chance to memorize it. But if you do this, you should take extreme care not to lose the paper you have written it on. You should store the paper in a secured locked location, and destroy the paper (e.g. shred it) once you have learned the password.