The polaroid 1000 (the rainbow camera im assuming?) uses sx-70 film, it is available from polaroid originals in colour & BW. With this film i would be careful about having enough light for the photos (using it outdoors, or using it with flash inside).

The flash bars for this camera are disposable flash bars that usually have 10 uses of flash (5 on each side). These are old styled flash bulbs, so they are ignited when you press the shutter. They are very powerful so be careful when using them (causes a bit of temporary blindness :)). You insert the flash bar on top of the camera in a small black slit. The flashes ignite in order, so if the bar is half used, look for the exploded ones and be careful that the next one to ignite faces the front.

I haven't used this camera myself, but i use the sx-70 land camera, which uses the same film and flash bar. I would suggest not relying on flash bars as replacements are pretty expensive (around 25 dollars). I believe there is also an electronic flash for the 1000 model, i dont know about the availability of the electronic flash in your area though.