Mount Cloudbreak is the first level as you enter the world of Skylandia/Cloudbreak Islands.
In this level you will mostly fight -
Chompies - 1 shot kill creatures
Non-evilized Greebels - Easy creatures that do a short range diving swing after a long wind up
Non-evilized Greebel Screwballs - Creatures that shoot a lob/straight shot to wherever you may be standing
Chompie Pods - A non-attacking infiniate spawner of chompies
This level is extremely straight forward as it is meant to teach players how to play the game and what each part of the game is. You should experience minimal troubles with this level.
If you are struggling during this level you may want to consider dropping the difficulty or buying more skylanders, this will allow you to have higher leveled characters or a wider range of back-up characters.