Been going for 5 years (04 was Superbike). It's a lot of fun, you're going to have a blast.
To me, the best places to sit, are either The Hill Turn 4 (you see Turn 1, 2, 3, 4, 5 & the big screen TV. Or, The Hill Turn 2, which you see all of the above (except the TV) but from another angle.
Turn 4 has a great view, but Turn 2 is *really* exciting to watch from because it's such a tricky corner. You almost always see double overtakes in Turn 2, where someone will out brake someone else in 2a, but they get repassed by the same guy in 2b. Awesome corner!
And of course, during practice or Qualifying, you *must* make your way over to the Corkscrew to witness that. The Corkscrew is WAY steeper than it looks on tv.