Some of my own to add, Do's and Don'ts
-Don't be a table pro. I hate playing live games and there is somewhere there to throw out statistics, odds
, numbers, etc. They're also the ones who tend to berate another player's mistakes.
-Wearing a No Limit Texas
Hold 'Em shirt with a skull in a cowboy hat, smoking a cigar and holding A8 suited in it's bony hands with your wrap-around rayban sunglasses and your death stare doesn't make you a good/look like a good player. You just look like a douche...and you probably play like one, too.
-While your goal is to take money from other players, it doesn't hurt to be friendly. I like to have a friendly, talkative, just-here-to-have-fun image while keeping my goals in mind. If you're the table jerk, you're going to have a lot of people gunning for you. Also, by talking to other people about general stuff, you can get an idea if they're playing for fun or if they take the game a bit more seriously.
-Bring gum. This is one of my favorite tricks. Having something to share with the table is a very nice gesture when trying to promote a nice, friendly image. After, I've established a friendly image, I like to pull out a pack of gum (preferably one that last a long time) take one, and then offer it to the table. If I'm lucky, I'll get quite a few people accepting because who doesn't like gum?
Chewing gum is natural, just like breathing. You just do it automatically when if pop it in your mouth and you'll continue chewing as long as it remains in your mouth. When it comes to poker, if a player is bluffing, they usually tend to try and not do anything that'll get them noticed. And the things we do subconsciously, we become a bit more conscious about. For example: breathing. We don't think about inhaling and exhaling, we just do it...but if we're trying to bluff at a big pot, we might become fully aware of our breathing pattern and might think..."let me hold my breath so they won't notice I'm breathing hard."
...The same with gum. A player who is comfortable with chew with ease and probably not pay a lot of attention to it. But if they're bluffing at a pot, they might notice that their chewing could bring attention to themselves and will stop. This a good tell to look for when you're playing. Most people chew gum at the same constant pace. If they suddenly stop chewing, it's possible they're bluffing at a hand and don't want to draw attention to themselves. If they start chewing deliberately slower than normal, it could be because they have a very strong hand and they're trying to tone down the excitement they feel.