I gotta disagree with the guys who try and shame kettlebells. Are they all Pavel claims, no. They do have their place in training. That said, the DVD sucks. I would suggest going with the H2H or one of Mahler's DVDs. I even tried going onto the Dragondoor website and found little in the way of programs. The KB is different than a barbells. Thats probably why some of you don't like it, you can't see the difference.
The foundation of a good KB workout is the swing. Once you get it down so you can swing ten times with each hand, alternating back and forth about every ten reps or mre for fiftyish reps per arm, try using the snatch.
Once you get that down, try learning to juggle. I know some of you will laugh your ass off at juggling for a workout. I all I can say is give it a shot. That's where the H2H stuff comes in. That will help your explosivnes and conditioning more than anything above.
At some point you will need to get another one. Some people will get one of the same weight, that is were Pavel will make you poor. For now, going up to weights (8K). Then keep juggling you light bell and start over with your swings and jerks with the heavy bell.
If you follow that progression, I doubt you will need more than three bells in your first year, although that could vary depending on where you start.
I know Pavel and others try to sell you the bells based on strength training. I wouldn't suggest going with that approach, it requires a lot of KBs and seems like you would be better off with a DB or BB ot just a plain old gym membership.