As any other currency you don't get it for free, so you should offer a service and accept bitcoin payment in order to get some; you might even take the risk and invest or trade with it, but due to the fluctuation in its price it won't be a stable source of income you can completely rely on.
Maybe yes, maybe no, because it depends on what job you do have, if you are earning big in your job more than what you could earn in bitcoin then there is no reaso to quit your job, but if it is the opposite, then why not quit your job since you are earning more in bitcoin, it would be just a waste of time if you are not going to quit your job.