I learned mindfulness meditation using the Headspace program called Take 10. It's a great guided meditation program designed to teach meditation to beginners. You just sit and listen to the guided meditation for 10 minutes every day. It's super simple. I think the app is not free but I just downloaded those mp3s on pirate bay. I think this torrent might be the one I used. Check out Insight Timer, it has a bunch of guided meditations. I also like to listen to 10% Happier, which is a podcast about meditation, Buddhism, mindfulness and so on.