Pavel Tsatsouline introduced the kettle bell to the west in 1998 and started a revolution. Pavel possesses a great deal of experience in training for strength as a basis for improving performance in all areas. Courses can be found at https://strongfirst.skilltrain.com/Pages/Public/Courses.
Additionally you can find introductory content on YouTube from Pavel and other great sources like https://www.youtube.com/watch?v=L7WBlfj2tpc.
The most important part to focus on with kettle bells like any physical training protocol is form. Research proper form and continually self correct. Stretch between sets and listen to your body to avoid injury.
Kettle bell training is intense training so if you are not experienced with physical training, you should consult a doctor before beginning this type of workout.