So when you vote on a post, think of it as an investment. You aren't going to get the money from your vote but you are investing it in that Steemian's post. You are saying you think it will do well and then if it does you'll reap curator rewards. So when you are browsing if you see a post that you think will do a lot better than it already has give it your attention. Vote, resteem and comment on it. Curator rewards aren't super meaningful to us noobs but they do add up eventually.

Just one more way to earn and build an account! Thoughtful commenting is probably the best way though as a noob.