First you need to decide what type of meditation you want to do. There are basically two types of meditation - active and passive. Passive meditation is clearing the mind of all thoughts. You can then allow your "inner voice" or "minds eye" to speak to you. Passive meditation is good for reducing stress, increasing creativity, or just getting in some quiet time.
Active meditation is when you keep your mind active by working on a particular problem in your life or focusing on accomplishing certain goals you have set. Using affirmations while meditating are particularly helpful in this area.