Below is the Bowls Canada Boulingrin's latest version of the Bowler's Handbook published in 2017. This handbook has sections from "Introduction to the Game", to the "Basic Hand Signals" used in the game. This is a good read for both beginners to the game, and for the most experienced Bowlers.
Also, the Laws of the Sport of Bowls published by Crystal Mark, for those looking at in depth rules and international rules for tournaments.
2017 Bowler's Handbook
(Bowls Canada Boulingrin)
Laws of the Sport of Bowls
(Crystal Mark third edition)