As you play the game you will get better.  When I first started I was the worst player ever.  I couldn't keep a straight face or anything like that.  Just play it cool and know all of your stuff.  Good luck, if you play.

 
When playing the game try to keep a straight  face. When you get a good hand don't smile or yell anything.  If everybody else is checking just bet a little.  Don't overdue it because  they have nothing when they check, most of the time.  Again, barely talk.  Try to keep the straightest face as possible.

 

One of the most powerful uses you have is bluffing.  Bluffing is when you have not a great hand and you bet like you have a great hand.  Don't bluff to often.  They might catch on to you and call your bet and you will lose the hand.  You don't want that to happen do you.

 

When you are just about to start a game, sit the furthest away from the dealer as possible.  You do this because you can play your hand off of everybody else's.  You have a better chance of winning that way.

 

When playing a game try to read the other players.  If they check that means either that they have a good hand, or a terrible hand and they are waiting for something to come up on the flop.  If they bet little, they are trying to get you to keep on throwing out chips every hand so they get more.  If they bet a lot they are bluffing or they have an okay hand, (depends on how they played their previous hands).
After you win a big hand don't act all good just because you won a big hand.  I have won plenty of hands and been cocky about it and never won another hand that game.  If you play poker and you win a hand, don't be sure that you will win the rest of the hands.  Keep it cool and play the game to the best of your ability.