A couple of things not totally related to how you play, but I noticed the following when I started playing live:
1) Remembering your cards and suits... Online, your cards are always facing you. Get used to looking at your cards and not needing to go back and look at them during a hand (at least that is the way I like to play). For example, you get 10 Hearts, J Diamonds... Flop comes... now, was that 10H, JD or was it 10D, JH??? At first you may not remember the suits; heck, at first you might forget even what the two cards were.
Some players feel it is easier to read other players that go back and look at their cards. Some feel that it means that they do not have a pair, but are determining if they have a flush draw or confirming connectors... I personally do not like to look at my cards again once the flop hits the table.
2) Size of Pot... Again, online the pot size is always displayed on the screen. I personally don't ever ask for the size of a pot. If you are into making pot sized bets with certain hands and calculating certain odds
, then knowing the size of the pot at any time can be important. It takes a bit of time, but after awhile it gets easy to subconsciously track the action going into a pot.
Good luck - I'm sure you'll do fine... alot of new players are always trying 1/2 and many don't even have an online background.