You start out by creating your own character and picking a starting class. You choices are initially narrowed down to Warrior, Mage, Rogue and Priest. However, it doesn't make that big of a difference simply because as you play the game, you are free to change classes at any point simply by switching your class armor.
The game plays like your typical MMORPG. You talk to npcs, get quests, complete quests, level up and collect loot. There is currently a level cap set at level 20. However, there is an added feature called a class rank. Class rank is used to determine when you get new abilities. Instead of purchasing abilities at certain levels, each time you get a certain rank you will acquire new class skills/abilities or spells. It's kind of like having two different experience bars.
Each time you level up you get access to upgrades called enhancements. Enhancements make the gear you are wearing stronger. Also, upon leveling up, your hit points and your mana pool will grow slightly. There are a several areas for you to explore along with a few quests for each area. The zones are split up in to varring degrees of difficulty. With different zones having harder quests and deadlier monsters. If solo play is more your style you will find plenty of that. If party based play is what your looking for, there are a few quests that will require a group to complete.
The only item you wear that is of any importance is your weapon. All skills, abilities and spells are based around the amount of damage your weapon does. All other pieces of gear, as of right now, are meerely just there for changing the appearance of your character. While this might sound dull and boring, it's actually quite addicting once you start seeing a lot of the different armor styles you can collect throughout the game.