Always purify the equipment you will use in your witchcraft.
This applies to everything...candles, parchment, pens...
Magic is all about psychic energy. Any items you buy will have been
handled by many other people. Their psychic residue will still cling
to your equipment, and might interfere with your work.

There are many different types of purification ceremonies.
Here is a simple one for you.

On the first day, place some salt into a glass, hold the glass in both hands
and say
"I purify and cleanse thee. Thou art cleansed and purified now."

Place the glass upon your altar/table on which you plan to perform your rituals.
Cover the glass (salt still in it) with a clean white cloth. Leave for 24 hours.

On the second day, place all your equipment on the altar.
Sprinkle the salt from the glass upon the altar and say
"Instruments of my Will, I cleanse thee in the name of all that is Good and Holy.
Thou shalt serve my Will with complete fidelity, so cleansed art thou now."

Cover everything with large white cloth, place your hands on the cloth and say

"In thy purity protect these instruments. Purify! Purify! Purify!"

Leave all items for another 24 hours.
On the third day, everything is ready to be used with your spells.