There are four ways I use to get bitcoins from zero. The first thing I do whenever I don't have any amount of bitcoin left to invest is to join a signature campaign for me to earn some bitcoins that can be used to invest. The second way I do in addition to signature campaigns whenever I don't have a bitcoin to spend in investments is via gambling but instead of depositing I don't deposit. I just get some satoshi from the faucet provided by some gambling sites and I try to get it reach minimum and most of the time it works. The next thing I do is being done by me only after a payout in a signature campaign and it is altcoin trading. Most of the time I get good returns in my investments and eventually reach near 1 bitcoin using this method. The last method I use but I don't always use it is via investments. I just invest only on the sites that my bitcoin buddies use since they are huge risk takers and knows many investment sites that are paying but I do it seldom since it mostly turns into scam fast.
How much you can get from the faucet that the casino provide. So basically from my understanding you do not deposit any money on the site. Bitcoin investment sites will almost always guaranteed to transform into another scam and the webmarter will run away with your money
Congratulations in your journey to get from 0 to almost 1 bitcoin, it pays to work hard and keep the focus to reach a goal
and once its not i move to the nex, i get a decent amount of bitcoin each month. i also signed up to a sig campaign and sometimes i buy some from localbitcoins or bittylicious. 
! it's a win-win! 
.