Yoga is great preparation for meditation. If you take a class, the teacher would probably be happy to give some quick meditation instruction to get you started.
This will get you going too.
http://chicago.shambhala.org/meditate.php
Peace
Meditation/Yoga is fantastic for everyone in learning to calm the mind but particularily helpful to ppl with ADD and ADHD in teaching breathing and control.. It's all about control.. peace out Headband707