Some basic questions about submitting cards to PSA

[Bored5000]

Some of these questions may be incredibly obvious to those of you who have submitted cards to PSA previously. But since I have never submitted a card to be graded, I would appreciate any help people can give me.

I have a bunch of 1972 STP racing cards (and a few other oddballs) that i would like to get graded. I am thinking about traveling to the Philly show in three weeks, since PSA will apparently be in attendance.

* If I drop off cards on Saturday of the show, is there any chance they would be graded by the end of the show on Sunday, or would I have to have them mailed back to me?

* I see on PSA's website that they have a $199 membership that includes 15 grading vouchers. Would buying a membership online prior to the show be my smartest bet?

* Could I print out the vouchers immediately so that they could be used in three weeks?

* Am I supposed to have paperwork filled out and the cards packaged in a box if I am dropping them off at a show?

* I have one card that is definitely worth over $499. Would that be any kind of an issue to pay for that one card separately with the same order along with the 15 vouchers for cards valued under $499?

*If dropping cards off at a show, should the cards be placed in penny sleeves/card savers for submission?

Thanks in advance for any replies.