For UPS, call 1-800-BAT-CREW, and follow the prompts for the jumpseat. When you get a human voice on the line, ask specific questions for the gateway that you want.
When you arrive at the gateway (more than likely via taxi cab), the first thing you will encounter is the rent a cop that will search your bags and body. Ask the guard where flight ops is located, and go there. The folks in flight ops will actually check you in for the flight, give you your paperwork, and possibly introduce you to the crew, if they are around. Our gateways/domiciles range from huge (SDF), to tiny little trailers (MHR/Sacramento) and (SNA/Orange County). Chances are, you will see your pilots at the small places, and never be able to find them at SDF during the sort. In SDF, they have large flat screens on the wall that list the flight#, destination, Capt's name, and most importantly, the ramp#. You'll have to go outside and stand under the sign for the ramp you need. There will probably be a van sitting there to take you to the aircraft. I would be getting on the van no later than 45 min prior to departure time.
When you get to the aircraft, leave your bags at the bottom of the stairs, and go up and introduce yourself to the crew. Ask them where you should put your bags. If you are the only jumpseater on say...a 767, there is plenty of room for your stuff on the flight deck. On a 757, your bags are more than likely going in the belly. At any rate, ask first.
If you made a reservation 24 hrs in advance, and the crew rates a meal....you will have a crew meal on the aircraft also. There are plenty of drinks onboard the aircraft....water, OJ, V8, Cokes, coffee, tea, etc, for your drinking pleasure.
I hope you enjoy your jumpseating experience at Brown!