The most important thing to remember is to read your opponents. Don't get too caught up in the etiquette, though you should know the basic rules about raising, betting, etc. Try to learn them, but don't let them distract you from the most important thing which is the players.
If you are going to be playing low stakes ($200 buy in or less) the players will be terrible and will be giving away their hands left and right. Make sure you pay attention to the people playing the hands where you fold. If the really old guy that folds all the time raises you, you're going to lose 99/100 times. If the crazy guy who plays every hand raises you, you will have to call with a much wider range of hands.
Don't get me wrong, knowing proper etiquette is important, but knowing the players is where the $$ is.