What you will need:
Two white candles representing the God (right side of altar)  and a Goddess (left side of altar) Your favorite smelling incense. I like to use frankincense and myrrh because it's known to ward off any negativity. SEA SALT!! This is very extremely important and you can buy it almost anywhere sea salt protects a person from any and all harm. Your favorite type of oil, for example people like the smell of rose or some people like to use their zodiac oil if you want you can use olive oil

What you need to do:
Your altar should have on the upper right hand a white candle representing the god and at the upper left side a white candle to represent the Goddess. In the middle there should be sea salt in a cup or cauldron with boiling warm water the incense should be at the very bottom facing towards you.

Take your oil and anoint each item on you altar. With the candles you want to start in the middle and rub up, and to go down start in the middle and rub down  while anointing say these words:
"I ward off any and all negativity, in my home, work, school, and in my everyday life, No evil or negativity shall enter here."

After you've anointed every item picture a white light around you when you feel like the white light is over powering picture the white light hovering over your home, work, school, when you feel ready say these words.....

"Psychic vampires who lurk in the night
psychic vampire who try to destroy my life,
destroy no more of what I have achieved,
destroy no more of what I have received,
negativity is not welcome
evil as well is not welcome
in me, around me, or around people I love."

Say this out loud or to yourself but say it enough times so you feel it has worked. When you are done picture the white light around you and your home work school etc... and let the white candles and incense
burn until it goes out by itself.