I wouldn't worry too much about it. If you do mess up somehow, that's what the dealer is there for, and you messing up will do your table image more good than harm.
Basic advice:
- Don't string bet (i.e. say "I call... and raise" or throw however many chips you need to call in the pot before putting in a raise without specifically saying "raise" first)
- Always protect your hand. Use a chip or a card protector seeing as you probably don't want your
hands covering them.
- Organise your chips however you feel comfortable with them as long as it's easy for everyone else at the table to see roughly how much you have (i.e don't hide a $1k chip behind a wall of $10s or something
).
- If you need a chip count or any similar help, ask for it. There's no shame in asking and nobody will think any the less of you for it (and even if they did, people thinking less of you is good for table image).
- Wait until it's your turn to act before looking at your holecards (there are lots of reasons for this - so you don't give tells away before you act, so you can keep an eye on other players etc etc). Try to avoid having to re-check your cards by remembering exactly what they are (so you don't have to check whether your QQ has a spade when an all-spade flop comes for example, as many people do).
- Most importantly, have fun! Don't be too concerned with winning money or not looking like an idiot - it's your first time and poker is as they say a long-run game.