I suspect ecc83 will be along when it's morning in the UK and he will be a wealth of information.
However, may I suggest a book: "The Yamaha Sound Reinforcement Handbook" by Gary Davis and Ralph Jones should be the first reference book on the shelf of anyone getting involved with sound. Ignore the "Yamaha" and "Sound Reinforcement" parts of the title. The information in there is of use to any aspect of the sound industry. There's even a specific section on interpreting specifications and why, very often, manufacturers' specs are made meaningless by giving only half the story.
That's what I do. I drink and I know things.
-Tyrion Lannister (and Bobbsy)