bitcoin is also money.
if you want earn money from bitcoin,just search some way to get bitcoin and then trade it to your local currency,its easy way to get money from bitcoin.
and way to get bitcoin is so many,one of it is join a good signature campaign.
How to make money?
All the answers will also applies to bitcoin also. More over some extra ways too available with bitcoin ecosystem. But those are slow earners, will not be enough for a living a life. If you consider earning money with the help of bitcoin, then you must start a business based on bitcoin.