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 
Do you mean if you can join signature campaign even you are a newbie? If that so then you may, as long as such signature bounty campaign accept participants for newbies. There are some signature campaigns that accept even newbie to participate, but this campaign are very rarely to have
And if what you mean is that, if you can join bounty campaign other than signature campaign, then i may say that you can! As long as you have all the necessary information and requirements needed by such campaign.