Having tried each class through 15-20 levels so far, the easiest starting out are Warrior, Guardian, and Rangers.
Warrior is very straight forward, smash things until they die.
Guardians offer a ridiculous amount of survivability and area control (depending on how you set ‘em up, I’m partial to Mace + Shield for blocking and interrupts)
Rangers survive through their pets, so if you went that route I’d recommend tracking down a Bear or Drake, they can both take a ridiculous mount of punishment and give it back in spades. 8/10 encounters, enemies (in PvE) will focus on your pet, allowing you to sit back and fill them with arrows.