Basic live tourney poker 101:
In the early stages, play tight, looking for only premium hands in position; you want to give yourself that super tight 'only the nuts' type image. Keep this in mind especially when you showdown in early levels.
As the blinds go up, you'll want to open your range a bit, but still stay fairly tight, and focus on position. Hopefully the early image you've established will help you steal those all essential blinds and antes.
Also pay attention to the other players tendencies; are the folding more than calling? Are the big blinds defending? Are there lots of 3 and 4 bets preflop?
Poker is a game of information, and the ability to adjust based on the information at hand; you probably already know this.
My last piece of advice is to be patient; online players are used to fast action, multiple tables, and 'shot clocks', so in live play, you really have to slow down. I like to say 'be actively patient', meaning that while you know you'll be folding most of the day, stay aware of the action; who's doing what, what hands are winning, etc. So when you do pick up a monster, you extract maximum value.
Okay, that's my input; best of luck and skill to you, hope you take it down!