Hmm.. Well, a brief explanation:
You create a character. (Night elves, Humans, Trolls, Goblins), You choose the way it looks, and what race it is, and what they do. (Some are hunters, rogues, warriors, etc.)
The game is mostly of quests. Such as one says, "Kill 10 bears" and you do that, then you go back to the person who asked you to do the quest and they give your armor, money, food, etc. Quests are the way you level up and the highest level is 100.
You can mine rocks, or collect herbs, or cook food, fun things like that. You can buy or sell whatever you wish.
There are some quests that you can only do with other players, but there aren't many like that. You can fight someone too, all you do is ask and they accept or deny your offer. I don't fight others.
All the quests are different. And there are lots of people who play that you can be friends with. The friend I usually play with is a good friend, I don't really talk to strangers. Speaking of, you can role play, but I don't do that either.
Hope that helps. If you have any more questions let me know!