“Meditation” is a bit open ended.
If you want an intense meditation learning experience the vipassana folks offer a secular and free, including room and board, 10 day silent meditation retreat.
Here is their write up and a little video:
http://www.dhamma.org/en/vipassana.shtml
A less intense start is pick an uncluttered spot, place an object (like a small stone) about 2' in front of you, and sit cross legged or with your legs folded under you (or in a chair/stool if you can't sit in those possessions) and rest your hands in your lap. Then just look at the stone and count your breaths from 1 to 10. You can start with just 5 minutes a day and work up to what you find effective. You should keep at it at least until it bothers you.
The trick is to try and do this every day. It is the long term daily repetition, not any particular length, that is key.
What will happen is you will get bored and you mind will start throwing things at you to distract you. Notice this and go back to looking and counting breaths.
You'll doze/drift. Notice this and go back to looking and counting breaths.
You'll think how bad/good you are doing. Notice this and go back to looking and counting breaths.
You'll get frustrated, think this is a waste of time, have various weird experiences, think of stuff you need to do ... Notice this and go back to looking and counting breaths.
Then your knees will hurt, your nose will itch, your back will hurt, you'll need to pee ... Notice this and go back to looking and counting breaths.
Over and over and over, some distraction. Notice this and go back to looking and counting breaths.
What you are doing is building a mental reflex to maintain your focus. Eventually this will become more effortless but in the beginning it can be difficult. Its easy to see that you shouldn't dive into the distraction. It is harder to see that you shouldn't push it away either. The idea is to stop interacting with it and go back to what you were doing. This refocuses your mental energy and the distraction will dissipate if you don't focus on it, eventually.
Pretty soon you will notice you can direct your attention and you can dissipate internal distractions and sit through external ones. Pretty nice skills. Also you'll notice that instead of being bored, you can meditate instead.