Kettlebell workouts for beginners?

I keep hearing good things about them but haven't actually tried anything yet. We have them at the local gym but I figured this would be a good option for home workouts as they take up minimal space. I just heard that if you don't have good form, you could really hurt yourself. 

Does anyone here do any kettlebell workouts? What would you recommend for a beginner in terms of weight of the bell? 

I am looking for something basic/easy to start, preferably something on YouTube or a guided page showing correct posture with pictures.