If you want to buy them all at the same time, go here.
Before I get started, it's important that you have a basic understanding of movement (movement can be difficult in the beginning, and this is where a lot of the good ideas come from). You may be wondering what is the difference between a "kettlebell" and a "kettlebell swing"? For the purpose of this article, we'll define a "kettlebell" as an object which uses a series of small weighted objects as a system of resistance, instead of a single heavy object like a barbell. A kettlebell swing is a similar thing but the object is one that uses a single weight with many smaller objects instead of one big weight. There are a lot of different kettlebell swing types in use, and the types that you may find most popular can vary dramatically from kettlebell manufacturers to manufacturers. What this means is that it's important to know what kind of movement type you want to develop to get the most out of your swing. If you've never swung a kettlebell before, start with a dumbbell (with some kind of dumbbell attachment) and swing from the top down. It's best to start with dumbbells that are light, and then move on to something that's heavier.