Another one who came for bounty, uh  
Okay, first of all, learn about crypto using resources like blockgeeks. You should understand some general principals so that you won't be scammed along the way. Second you need at least Jr. Member rank to participate in most of thw signatures campaigns. Bounties are not only signatures. If you have Twitter account or Youtube channel with many subscribers you can start right now. Also keep in mind that many airdrops are scams. Usually it's not worth the effort