Penn State was also my first interview. It is very laid back and easy. The typical questions can be found on the interview feedback part of this site. Overall I think it's one of the best schools to start your interviewing at. Winnie is awesome.
this is a great interview experience for ya if its your first, so dont worry about it, be be sure to wear comfortable shoes cause you do have to walk a bit for the tour
What everyone said is definitely true. It's low-stress and relaxing...a great first interview! But definitely wear comfortable shoes (of course, that should be a rule for most interviews...).