good question .this is the question most of the newbies having.initially most of the newbies sont have enough capital to invest.acctually i also had same problem . i would like to suggest/ tell my experience how to earn god capital without investing. my chouce was airdrops and bounty.  i made twitter facebook and bitcointalk account with good rank/hi number of followers/ friends. tjen i started to do airdrops. i applied for each and every airdrop and started to do some bounties. after 3 months i got more than 3000usd from air drops and some more bounty rewards. so i bought some bitcoin from market dip . this is the way i started my career.then i invest my bitcoins in various projects/icos.this is the best way for success.goodluck