I know it may seem simple to some people but not everyone is confident about how to properly reflint and rewick a Zippo, hell I've had people come in to my shop and ask how to put gas (butane rather than petrol) into one...
Anyway lets continue.
You can also learn a few basic Zippo tricks in my new instructable, Basic Zippo Tricks
Once you're finished with them you can learn more with the second round of tricks.
If you're too lazy to read here
's a video: