1. Thousands of sites (obv not all legal)
http://humor.about.com/od/soundbites/Sound_Bit es_and_Sound_Effects.htm is just one
2. I assume so...again there is probably a free-2-download program, or a demo version available on the net. You choose what sections you need, and "cut it out"
3. Most of the files will be in a format that can be easily burned to a CD, or played through a laptop / computer
4. Doubtful. A Laptop is probably a good option
5. Having done a similar thing...I had a dozen or so tracks on a CD, and just played the first 10 secs etc..hitting pause when needed - thats the very basic option, but works if youre short on time