Ok, that helps a lot. Now I can tell you that you will be in a Viewliner sleeper, the other choice was a Superliner sleeper.
You room will contain two seats, a toilet and a sink. There is a small cubbyhole that can hold one suitcase. Additionally you will have a small TV screen in your room which usually will show first run movies and recent comedy shows from TV. They also toss some cartoons on the tapes for good measure. You can click
here to see a 180 degree shot of the Superliner style standard bedroom. While not completely identical, it will give you some idea of what to expect.
As I mentioned before, all of your meals are included as long as you take them in the dining car. Your sleeper tickets qualify you as a First Class passenger on Amtrak. As a first class passenger you are entitled to utilize Amtrak's first class lounge in Philly. These lounges are a nice quiet refuge in the often-bustling train station. They have nice plush chairs, conference rooms, computer terminals, newspapers, TV's, free soft drinks, juices, coffee, tea and clean safe bathrooms. They also allow you to board your train before the rest of the masses.
In Philly the lounge is again on the second floor, but the entrance is kind of hidden down a long hall in the corner of the station. Walk down towards gate 1 and you should see the hall leading to the stairs. Go up the stairs and ring the bell next to the door. Show them your tickets and relax.
I'm sure that others will chime in here with more on train travel, but this will get you started.
Have a great trip.