Hey, welcome to the forums. Try not to be here too long, like me. Ha.
Don't worry about the Sig and Avatar. Eventually, it'll come to you. If anything, you could always go into the Graphics Section and request a set. That is, a Sig and an Avatar. A lot of them look really flashy. ^-^
Anyways, Have fun, enjoy yourself, and if you ever need anything, feel free to PM/IM me.