If you have a Guru in the Vama Marga (Left-hand path) or Dakshina Marga , ask them. Authentic initiation requires abhisheka (consecration). No PDF can replace a living teacher.
For those interested in learning more about Bhoot Damar Tantra, the following resources are recommended: bhoot damar tantra bengali pdf upd
Several digital and physical versions are available specifically in the Bengali language: Internet Archive (Digital PDF) : A digitized version of the Bengali Bhutdamar Tantra If you have a Guru in the Vama