Put some gas in that beotch.
The vac line is going to have to come from the engine bay, unfortunately. Look for holes in the firewall. There is one behind the battery area on the passenger side, but you'll need to remove the fender well liners to get to it.
I had a bunch of stuff that came in at the drivers side of the car. I found a 1" rubber grommet at AutoZone and used a 1" hole saw to cut a new hole in the firewall. Everything on that side of the car runs through that grommet. It's a PITA, but it's nice to have a readily accessible hole in the firewall to run wires through.
You need a 12v accessory line. You can easily tell what is powered on with the car when you turn on the key with a little investigative work. Use a test light or a multimeter and power the car on. You can check for a good one by putting the positive lead on one of the holes on top of each fuse. Be aware, though... some have more "noise" on them than the others.