Well if you have a job, make sure to invest some of the money, you get by it, at the end of the month in Bitcoin - like 5%-10% or something. I think this will be the most secure way, since you wont notice the money you are investing and you will always have some Bitcoin. Then just keep the Bitcoin and don't touch it - by a couple of years your investment may turn into "gold" 
The other thing that comes to my mind is to invest in some Proof of Stake alt coin that is promising - like for example Solarcoin, which is growing stronger and stronger everyday, and just let your wallet stake the amount and your coins will grow by a small amount everyday 
Right, investing is the good way for steady income that you want. And good investing must have a secured investment because many hackers are spying and waiting for the right time to do things wrong. So be vigilant and be active on investing if you want some steady income. The other thing that comes to my mind is to invest in some Proof of Stake alt coin that is promising - like for example Solarcoin, which is growing stronger and stronger everyday, and just let your wallet stake the amount and your coins will grow by a small amount everyday