<.< I keep gettin invited to a bunch of clans but I don't know if I should join one? If I do, do I have to do things with them and how do I change my name so that I can put "[D3V]" in it? Lastly, if I want to get out of a clan, how do you do that?

What you do within your clan is up to your clan really, though the most you'll probably do within your clan is some CvCs, or team-based games with them. Maybe.

Each clan has a three character alphanumeric tag, shown within square brackets. Thus, that [D3V] tag is a clan name, which you can get only by being in that clan.

Leaving a clan is easy. In the Community button, with the character sheet and clan, go to Clan and you'll see a listing of clan members. You can press Triangle (Options) and you have an option to leave the clan. So you can check some out, and if you don't like them, it's only a few button presses away.

Thanks for replying :3 I was thinking of making a clan with my friend but I'm not that interested in CvC really <.< Especially since I don't play the same times as them. I ranked 3 against people with like... 1000+ kills <.< I don't even have 200 yet >.> Dunno why they wanted to invite me when there are plenty other people who are better even.

A lot of clans recruit for member numbers, regardless of your playing ability. This is what I discovered with my first two clans, before finding a smaller, in-the-making clan, which picked me for actual skill.

Yeah I was thrown into a deathmatch but there were like 5 people or something. Was pretty fun actually, they said I didn't have to do much so it's a pretty good clan. The leader has like 3300 kills so I guess he's good >.>