Scrappy,
What level
VB will you be officiating? If you're starting out in Jr. High the Libero will probably not be an issue. If your looking at HS then it will. A rule book will help a lot. Watching some games with a L will also help a lot. If you are new to
VB, then I want to encourage you to strongly consider doing some lower level games at first without the L to get started. Then, after watching and asking a ton of questions, move up to the level where they use it. Also remember, that even though HS teams are
allowed to use the L they don't
have to. Some of your smaller schools will opt not do so. Your state association will likely have some handouts outling the L in more detail. Illinois does and so did Indiana.
Hope you like
VB. It's a lot of fun to officiate. But one thing to keep in mind: As I alwasy tell my BB or FB buddies who say how easy it is to officiate
VB...
VB is easy to officiate
VB .... but not if you want to do it right!