You'll need a battery to start with. PX-19. Costs about $9. I think Radio Shack sells them, or else you can buy online.
For film, you have a choice of Fuji FP-100C (color, ISO 100), or FP-3000B (black and white, 3200 ISO). You can also pick up some Polaroid left over pack film on ebay or from Impossible Project.
If you use the color pack film, I suggest you use a warming filter on it. How?
Get a 24mm Series V filter holder and retaining ring, and an 81B series V filter to go inside it. You can see my post in the Polaroid forum about how FP-100C needs a warming filter to give decent color rendition.
For the B&W film, Polaroid made a "cloud" filter (orange) which has a primary filter for the taking lens, and a small filter that goes over the photocell. Clever!
Fuji pack films bind when the big leaf springs in the back push down upon them. You need to work the metal springs back and forth until they break off from metal fatigue. Even then, the timer on the back of your camera may still make pulling the pictures out difficult.
Your camera's flash is synched for bulbs. If you want X-synch, you'll need to visit your friendly camera repairman. While it's there, he could switch out the back for you with a back from the 250, which doesn't have a timer.
If your pictures are too light, or too dark, fiddle with the lighten/darken control which is the collar around the lens. The photocell averages over a wide field, so any bright lights in the image cause underexposure. Unfortunately with these autoexposure Polaroids, you waste a picture or two getting the correct exposure.
Enjoy!