At the casino I go to, they typically only have $1/2 tables going, although you can get on a list for whatever stakes you wish to play at. As for table selection, it really depends on how crowded the casino's poker room is. If it's not too crowded, they will usually always give you assigned seating, but you can always ask to sit elsewhere.
When I was adjusting to cash games from tournament style play, the biggest shock for me was seeing how much players will raise preflop. It's a lot different from online raises too. Raises of 5-20x the BB are typical, and if you're at an aggressive table, it can be even higher. I suggest getting a feel for live play before making too many decisions too quickly, and play about 10-15% of your
hands.
And as Bob advised, do keep your bluffs to a minimum. Many people are there to gamble, and will call with anything!
Good luck at the tables! You will love it!