Obviously, the fact that you didn't follow NBA, Football leagues, or any other sports, it will be hard for you to do some analysis and make predictions if you consider betting on these sports. Not just that, even following professional analysts won't help you at some point since their predictions are based on their own set of preferences.
I don't suggest following tipsters as self-knowledge is really enough. But if you really want to push your goal to bet on those sports, then it's your decision to refer to others' picks in the meantime. Then eventually, while you are working on gaining knowledge on those sports, you can now choose on your own and make your self-analysis.