there are many excellent links and posts on meditation in the Social Groups - Mindfulness Meditation, and discussion of Buddhism. they are public groups, you can read without joining. (located at the bottom of the Forums Index page.)

essentially meditation is an activity which increases one's awareness.
what you do with that information depends on what you want to get from it.
if you are interested in reducing feelings of distress, then you might also want to use some thought-rehabilitation practices as well as physical care (eating right, sleeping enough, and avoiding stress whenever possible).

there are also links to CBT, DBT, Lojong and Affirmations in those forums.
another tool that helps some people is called Holosync. you can find it in various forms, but it is very helpful in supporting meditation for beginners, as it engages the mind and reduces distractions.

the positive effects of meditation on the brain are well documented, and long lasting. even a few minutes a day of intentional awareness can help the brain to focus longer and withstand more stress.

best wishes~
Gus