with any project that is gonna take a LOT of work, it's alwaybest to have as much planned as possible. At the very least, when you do a scene with camera switches, have that scene plotted out. That doesn't mean you can't adlib as yer going, but at least you'll be adding to the idea rather than starting from scratch. As for script, that's a must to have done in advance, at least for each scene. For a working aid, I recommend downloading a program called Magpie. When you input the prerecorded voice samples, magpie will analyze it and show you frame by frame what the mouth should look like for the pronounciation. Me thinks the registered or "pro" version also has the ability to autmatically output the mouth animations to Lightwave or something. Either way, its a oggie well worth getting.