I understand what you feel man, I am also newbie. But I think there's a lot to learn and understand here before we try signature campaign. just patience 
You are right actually will there are signature campaign that accept newbie but the payment will be cheap and it will waste your time and will be considered as spammings posts, the good choice for joint in signature campaign we must understand about the rule of bitcointalk first then we must have knowledge about the bitcoins and another digital.