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Most casinos have a set of rules for poker play and those rules may be different from what you might expect. So before you play ask the floor manager for poker to give you a printed copy of those rules and spend some time reading it.
When playing live always protect your hand. When dealt your cards put one hand on them until it is your turn to act and then if you do not fold pre continue to protect your hand. If a player accidentally discards their cards and they end up with hyour cards your cards are dead. If you are near the dealer they will grab your cards from time to time and kill them by mistake.
Also make sure no one can see your cards when you look at them. There are youtube videos on how to look at your cards playing live.
Know when it is time to pay your blinds and do so quickly.
Do not talk when someone else is in a hand.
Keep your chips stacked in 10's or 20's
try not to eat at the table and if you do do not touch the food with your hands.
If playing NL listen for the bet size so you do not have to keep asking or learn to count chips quickly.
Hope this helps