First thing first, you should make a habit of watching and reading news on regular basis. Here, you should make sure that you are getting news from a reliable and unbiased source, or else, you will lose interest in politics soon. For that purpose, you can find a network or magazine that does not lean in one way or the other, and is nont judgemental, so that you can reach your own conclusions.
Consider investigating about different current issues and major people in politics. You will need to familiarise yourself with the issues and key players, so make sure you do your research, even if it means going beyond your weekly newspaper and nightly newscast.
You also need to find out how the issues affect you. Know the implications of each of the issues and how they affect you and your daily life.
You should not only read and watch news, but also discuss them with your friends and family members. This way, you will be able to get varying views and perspectives about specific issues.
Finding out other people's opinions and point of views can help you develop a better sense of what you agree and disagree with, and why. Also, this will allow you to have a better understanding of the issue.
There is nothing bad in picking a side in politics. You should however take a position, based on merit and logic. Never give in to race, colour or caste while taking sides. Once you do that, politics will interest you even more.