Where can I find a book or a site for an EASY explaination on how to play Keno, Powerball, etc.?

Anytime I read the back of one of those cards or papers, it seems so complicated. I'm sure I seem like a dummy to all the people who whiz right through it, but if a person has never played it before how are they to know? So, is there some kind of "Gambling for Dummies" out there? Lol! That would be great actually : ) I want to know the ins and out of Keno and how I should pick the numbers on Powerball and Megabucks. I'm uming on some there are certain things you should know before you play and I sure do want to know before I do. Please help. Oh and I do already know about Video Poker and Casino Gambling such as Roulette or Blackjack. Thanks so much for your time!