1: You need _very_ fast shutter time - 1\1000 second is propably good. Then, you'll also need a fast lens - aperture 1.8, or 2.0 or something, in good light, and possibly also a high ISO speed, even though this makes for slightly grainy pictures. I'd be more detailed, but I don't know what equipment you'll be using.
2: I'm not entirely sure what you mean... Autofocus isn't all that, really, and bulb only means you open up the camera shutter and leave it open until you release the button. Typically used for taking exposures longer than 30 seconds, but also good for effect-photography, or events when you don't know when a brightly lit motif will come - such as, for instance, photographing lightning.
Hope that helped a little
