Know the Basics
Know what magick is. Know different ways to raise, direct and ground energy. Know how to cast a magick circle. Know how to open a circle. Know the basic outline of a spell.
Know the Intent or Purpose
What is it you are trying to do? Heal an illness? Increase your concentration? Bring love into your life? Sell a house? Celebrate a Sabbat? Before you begin any magickal working, you should have a firm grasp on what outcome you are seeking.
Know the Best Time to Work the Spell
Do you know what type of magick should be worked during the waning moon and what type during the waxing moon? What type of magick is best worked on the full moon? The new moon? What days of the week are best for what types of magick? Learn how the moon phases and days of the week affect magickal workings so you will know when to work your spell.
Learn which colors will bring what results. Learn a little about herbalism; which herbs can be used for what magickal purposes. Learn about image magick and how it works. Learn about elemental magick; which elements can be used for what types of magick.
This below is more for those in Wicca