we were all noobs once. Asking questions is a good thing. As far as who you can play with, that is simple anyone who is a full member ( not a recruit ) can confirm your games. I good lace to start is take a look at my friends list if you see CAG add them. Everyone is cool and can help you. As far as changing your clan tag. If you are doing hardcore you cap one letter for each game. If hardcore its one letter for every 2 games. People like hatchet are good to have on your friends list too. she is a recruit now but will be a full member soon. She is on alot and a good one to follow around a map she can get some kills. Keep working at it we will guild you through everything.