You should read the other threads because many time newbies ask this question. But once again, i tell you, now you are newbie and no one campaign accept you, wait for when you rank change, and than you read Overview of Bitcoiantalk, then you can understand which signature campaign accept you, because many good campaigns only start their requirement from Full members. So let see and read the rules of that campaign which accept you, than definitely you have no problem.
This is an answer that once I don't need to create a new thread.
Thanks buddy!
so the signature is for advertising of the campaign that you applied on for the campaign you choose so let me give you a link of the list of campaign : 
