Signature campaign is not enough. If you can find out a better idea like creating your own coin, it would probably best to try that too unless you are willing to keep posting until you can save more btc to invest on ICO. Freelancing on job sites can also be very difficult due to competition and while being a newbie its a lot hard to get a job especially if a user don't have a high rating from previous employers.
Well i am not saying that signature campaign is enough but since we are talking some steady income then it could be on the list. ICO's cannot be considered as a steady income as well.
Right, if you do signature campaign consistently, it can be a steady source of income. But it can be taken away suddenly too, so it is not really that steady. I think there is not much steady income in online world.