Here is a simple banishing spell to remove an unwanted person or unwanted negative energy from your life.
A black candle
A lighter or matches
Knife to carve into your candle (an Exacto knife can work)
Toilet or stream
A place where you can bury something in the ground.
Get four small pieces of paper and on each piece write the person's name or the name of whatever it is you need to banish. On the opposite side draw a pentacle.
Carve the same word and the pentacle on a black candle also.
Do what you would normally do as far as visualizing this thing or person being drawn away from you and ask the Goddess for assistance.
Light the candle.
Take the four pieces of paper and burn one, saying, "I banish ______ with the power of fire. So mote it be."
Bury another one in dirt, saying, "I banish ______ with the power of Earth. So mote it be."
Flush one down the toilet, saying, I banish ______ with the power of Water. So mote it be."
Then tear one into little pieces and throw it out your window, saying, "I banish ______ with the power of Wind. So mote it be."
Let your black candle burn down.