Can i join at the bounties i'm just new here but i created this account about 20 days before. I'm just using this to read threads but then i came here and see that i can work. But can a newbie do work here? Thanks In Advance 
Sure. But you can only participate in social campaigns like facebook twitter .. Your rank is too low to be able to participate in the signature campaign at bitcointalk. Try to make many bounty with social accounts. It takes a little time but will guarantee a steady amount for you