Meditation will allow you to clear your mind and focus on a specific working. Not only will it allow us to focus and concentrate, it will also allow us to attune ourselves on all levels and on all planes of existence. This means any magical workings will be more focussed and concentrated, allowing us to have more success and more accuracy in any and all magical workings.
I cannot stress enough how much of a building block meditation is and how important it is. It should be used as a foundation stone for all. Meditation will not only enhance your workings but will also enhance all parts of your life and wellbeing.
My personal meditations and techniques have Buddhist origins, however they can be easily adapted and manipulated in order to suit any and all situations and personal preferences.