can somone explain this to me

so, i signed up, but how do i like.... find my rank/ get into the actual fights with everyone.. never done the clan thing, 1: yes i do have a mic, 2: don't know if age is a problem or anything but im 15 and i'm not gonna be screaming into the mic because i got killed by a "effing camper"

so yeah... my gamertag is :Some Valtrex