What are you talking about? You don't need to know anything about NCAA basketball to fill out a bracket. That's the beauty of it!
Just follow the seeds. Pick a few upsets in every round. Make sure you pick at least one #12 seed to win one game, seeds lower than that you can pick at your own risk. I tend to pick teams based on how much I like their team name, or colors, or location, or whatever.
So c'mon and fill out a bracket. You only have to do it once and more people is always more fun. Besides, if you end up in last place it won't be because you suck, it will be because of random luck.
(Caveat: If you get last place every year for more than three consecutive years, then you suck.)