Most importantly, you need to understand and refer to the BWC notes in Saturn Planetary Considerations.
Naturally, we can’t give detailed information on this type of work on an open website. You will need to wait until you understand how energy and planetary influences, influence this style of work. Also, you will need to be extremely protected. If you do not understand protection magic and work, do not start death magic.
Be ready for your own energy to be drained, for perhaps days on end. If you get this magic wrong, the least you can expect is depression, low energy, or attack from the target.
Demons and other deity such as Hecate can assist as well – so research and include them in your workings.
BWC will not teach or assist with, learning or commenting on death magic.
Abaddon the Destroyer Death Spell
Feces Spell
See Cursing Spells