Club Penguin Island is different than the Classic version, where on Club Penguin Island, you can always find the Characters in their spots at all times, unlike at special times on Classic. Finding and Interacting with Characters, now is how you can began their Adventures, if you have a Membership.
Rookie is the first Character to be in a different room than Aunt Arctic and Rockhopper, he is located at Mt. Blizzard at the top of the mountain, you will need to waddle to the far right side and use either the Cannon to get up there or use the Green Trampolines to jump up. Once on top, Rookie will be on the left side.
Until next time,