Hi thorn1,
best way to make transparencies is using the printer manufacturer's transparencies which are not made of paper. They look as clear as glass (also used for overhead projections).
I don't know your location and therefor can't tell where to get photosensitive PCB material. Any no-name product of photosensitive PCBs requires test exposure and development due to inconsistence of the film applied (different mixture and different film thickness).
Since I use to order my stuff in Germany I order photosensitive PCBs at
Bungard Elektronik which is well known for consistent photoresistive material in Germany.
To develop the UV light exposed PCB you might purchase natriumhydroxyde (chemiacal formula: NaOH) and use 7g dissolved in one liter of lukewarm water. I guess you can buy it at any drugstore (it's also used to produce soap) or at your local electronics hobby shop as well as etching agents. Very common is ferric cloride (FeCl), an amber stuff which makes awefully ugly spots on your clothes and fingers, but also removes the unwanted copper of your PCB.
Boncuk