[Coffee]

I'd just like to chime in as a moderately successful low-stakes NL player to say that the majority of my +EV is my postflop play. It's not so much that you need to tighten up preflop, so much as it is that you should expect to have to showdown your hand to win. Many times, you won't need much more than a pair. But...you are going to outstrip the rookies primarily on your postflop play.

Oh...also...the biggest disparity between you and rookies is going to be betting aptitude. 8 out of 10 low limit players have ZERO concept of how much to bet properly. They'll either underbet or severely overbet the pot. In the first case, you will often have the right odds to draw. On the second case, depending on the player, you'll either know to bail out or to call, if he's the sort of rookie who likes to shove his stack in with less than the nuts.