1. If this is just a small production and you are not getting into stage fixtures, definately buy flourescent tubes, not incandesent bulbs. You can do this low budget from a home improvement store and cheap garage type flourescent fixtures (painted flat black) and you can get the tubes there also.

2. White teeth and t-shirts are your second worst enemy, next to light bleeding in from outside sources as theaterhelper mentioned.  It can't be stressed enough that the darker the better.

3. The audience on stage with the lights creates a LOT of issues. Their clothing, teeth, etc. reacting to the light, and the safety issues could be considerable.

4. You will have to experiment with what gives you the best luminescense. It all depends on  the material and the paint. Getting a white that works usually requires true phosphorescent theater paint, most store bought neon colors work if you use several coats and outline them in flat black. Don't paint your neon colors on top of the black though, you'll never get them bright enough if you do.

5. A few hard learned "secrets"- Neon colored poster board is highly reactive if you can use it, do!.........White gloves popping in and out of the light are a great effect and work well, just make sure they are clean, or they won't reflect well........stage hands dressed in all black will disappear completely if they wear a black hood............scotch tape glows under blacklight, be careful with it............this one is worth $$$$ so you owe me, there are several theater supply sites online that sell flexible neon tubing that you can cut and shape, we stitched it onto a black cat suit to look like a stick figure, the actor stood frozen for the first half of the act and then jumped out and started dancing, them went back to their frozen position. To the audience it looked like a neon sign came to life.....blew them away. Have fun, let us know how it goes.