If you have no bitcoins (or a fraction of it) you should offer your services or try to do tasks. Maybe you're good at designing and you can offer your sevices for an amount in bitcoin.
Well, it is a pretty good way to do investment in the bitcoin is trading. Because trading is much more favorable compared to the other, and also to profit in a short time. Trading also was much better, but I need to know all of these things have the ways and techniques. So if you want to get an advantage then you should be able to properly execute techniques namely patience
Gambling is for high risk takers who wants to make quick money without making any efforts to learn new things and they would be earning good amount of money if they are really luck but they cannot expect the same result each and every time.