ATTENTION:
learn the rules of the game, no not the rules of NLH, but the rules of live poker. I see way too many newbies lose lots of chips due to errors they caused themselves, with no recourse.
remember - verbal is BINDING period, whatever you say you MUST do. do not string bet, chips in is an auto call even if you didnt know someone raised (in most places) or you surrender chips in and muck your hand, acting out of turn is binding unless action changes, exposing cards early may result in your hand being killed, and many more rules like these,