It seems most of the typical mistakes have already been covered. As a tip, I would say, believe it or not, during your first few sessions, if you feel you are at a friendly table, or at least mostly of those seated close to you, you may try making a point to bring up in conversation the fact that you have only played online, and are not as familiar with some of the live etiquette. You may be surprised at how many people are willing to help you out here and there. Obviously, not helping you play your hand or anything, but just things that ultimately helps the flow of the game, which in turn helps you and them.
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