Gus,
I'm getting ready for it too.
You'll need:
bumpers
heater
defroster
backup lights
four way flashers
heat shields
form MV-426B
http://www.dmv.state.pa.us/pdotforms...ms/mv-426B.pdf
Pictures from front, side, back, etc.
All receipts
PA has an emissions exemption for cars driven under 5K/year
The car is inspected twice, first time to get a VIN via MV426, second time to get a sticker.
Best of luck,
Jim