One way to learn is to start reading books on the subject. You can get several from the tfguild online store. Get one or more as you can afford. Read glossary of terms first, so you'll understand what these new terms mean. Then as you are reading them start acquiring some basic tools, list of tools are in most books.
Then once you've got a understanding of what it's all about, try to go to a raising and watch, help if they will let you, and you'll learn a lot more. Good luck with your interest, and ask more questions.
Jim