SOE has posted a guide to help new and returning players choose a character class in EverQuest II.
As a new or returning player to EverQuest II, some of the choices you face when creating your character can be a bit daunting. One of those choices is your class. Here's some information on the different classes available in EQII, and links to some guides that might help you make this tough decision.
EverQuest II has 24 classes available to players. Class is chosen during the character creation process, after race, gender, appearance, and starting city are selected.
Please note that not all classes are available to all races initially. Races are chosen by alignment (good, neutral, or evil) and appropriate classes are then available to choose from, depending on the race alignment. For example, you cannot choose to be a Dark Elf ranger or a Froglok defiler during the character creation process. There are some exceptions to this rule when a character betrays their home city, but not during the initial character creation.
Classes are based on four main archetypal roles: the fighter, the mage, the priest, and the scout.
Read more here.