I am going to start by telling you which class to choose, according to your play style, because this is kind of important since the way that you play will impact plenty of things in game.There are three main classes in the game:

Warrior
This is a melee character which is mainly focused on surviving and will use his sword to defeat the enemies.

Mage
The Mage is a powerful AoE ranged damage dealer who do not have very high defense.

Archer
It is similar to the Mage, has a ranged AoE damage kit which focuses on mainly damaging enemies before they take you down.

I would suggest that if you are not very familiar with melee ranged characters, then you should definitely go for one of the other classes, which makes things much easier early on because of their range. In my opinion it is much easier to play as a ranged AoE class for a beginner, because it will help with defeating enemies much easier. But that's entirely up to you - choose the class that appeals the most to you, but remember that you will have to fill the role of either the tank if you choose Warrior, or damage dealer if you play Mage or Archer!