Leason 1 in doing magic: You must meditate. It is the only way to clear your mind, increase your focus, and concentration all at once. Doing this will help you focus on the energies needed for the spell and the spells themselves.
Once you have done that, try to sense out the kind of energy needed for the spell. Ex: healing spells require healing energies which can be found in water and earth. Candles and their colors may help as well. Ex: a blue candle could be used to represent water so there for may have healing in it as well. A white candle can be used for anything.