From the look of the warhorn, you are signed up for my table, so I'll give you a few suggestions of what to do to prepare:
1.) Sign up for an account on the paizo website and get yourself a Pathfinder Society #. This is how we will keep track of what you have played.
2.) Get yourself some dice if you haven't already. They don't need to be fancy colors, just a set of 7 will do. You can easily buy them at the store for about $5.
3.) If you don't own the core rulebook, we'll give you a pregenerated character of your choice to play for tomorrow.
4.) Pick up the pathfinder society roleplaying guide on the paizo website (its free) and give it a once over. You don't need to know the whole thing, but it'll give you an overview of how we work.
Of course you don't have to do any of this, but itll just make you that tiny bit more prepared.
Remember! Explore, Report, Cooperate!