From The Unfettered Mind which offers some great advice on the subject of meditation (take or leave what you will):
The Right Mind And The Confused Mind The Right Mind is the mind that does not remain in one place. It is the mind that stretches throughout the entire body and self. The Confused Mind is the mind that, thinking something over, congeals in one place. When the Right Mind congeals and settles in one place, it becomes what is called the Confused Mind. When the Right Mind is lost, it is lacking in function here and there. For this reason, it is important not to lose it. In not remaining in one place, the Right Mind is like water. The Confused Mind is like ice, and ice is unable to wash hands or head. When ice is melted, it becomes water and flows everywhere, and it can wash the hands, the feet or anything else. If the mind congeals in one place and remains with one thing, it is like frozen water and is unable to be used freely: ice that can wash neither hands nor feet. When the mind is melted and is used like water, extending throughout the body, it can be sent wherever one wants to send it. This is the Right Mind.
The Mind Of The Existent Mind And The Mind Of No-Mind The Existent Mind is the same as the Confused Mind and is literally read as the "mind that exists." It is the mind that thinks in one direction, regardless of subject. When there is an object of thought in the mind, discrimination and thoughts will arise. Thus it is known as the Existent Mind.
The No-Mind is the same as the Right Mind. It neither congeals nor fixes itself in one place. It is called No-Mind when the mind has neither discrimination nor thought but wanders about the entire body and extends throughout the entire self.
The No-Mind is placed nowhere. Yet it is not like wood or stone. Where there is no stopping place, it is called No-Mind. When it stops, there is something in the mind. When there is nothing in the mind, it is called the mind of No-Mind. It is also called No-Mind-No-Thought.
When this No-Mind has been well developed, the mind does not stop with one thing nor does it lack any one thing. It is like water overflowing and exists within itself. It appears appropriately when facing a time of need. The mind that becomes fixed and stops in one place does not function freely. Similarly, the wheels of a cart go around because they are not rigidly in place. If they were to stick tight, they would not go around. The mind is also something that does not function if it becomes attached to a single situation. If there is some thought within the mind, though you listen to the words spoken by another, you will not really be able to hear him. This is because your mind has stopped with your own thoughts.
If your mind leans in the directions of these thoughts, though you listen, you will not hear; and though you look, you will not see. This is because there is something in your mind. What is there is thought. If you are able to remove this thing that is there, your mind will become No-Mind, it will function when needed, and it will be appropriate to its use.
The mind that thinks about removing what is within it will by the very act be occupied. If one will not think about it, the mind will remove these thoughts by itself and of itself become No-Mind. If one always approaches his mind in this way, at a later date it will suddenly come to this condition by itself. If one tries to achieve this suddenly, it will never get there.
An old poem says:
To think, "I will not think"-
This, too, is something in one's thoughts.
Simply do not think
About not thinking at all.