Dont play around too much early on. If you bluff, and take down the pot, you win a few BB. If you bluff, and lose it, you'll lose a lot more than you stand to win. So just sit tight early on. But later on, once the loose donks have busted out, then it's time to get tricky (But still play well). Take notice of how your opponents play and if you sense weakness, bluff at the pot (But dont bluff too much because if you get called you dont want to have lost out on much, so a few times the min bet should be enough).