In my defense, to be an effective debater you need to be very well versed with the topic you will debate about. So the first skill is to sharpen up your knowledge, you study. Another thing is, be an execellent communicator, your knowledge about the topic will be of no use when you cannot articulate them. You can also look up(watch videos) to people or debaters who are really good at what they are doing. So equipped your self and battle up.