It seems most people have already said pretty down to earth things about jobs, so I won't add my two cents to that topic. But I do have some opinions on this subject:
I think most new creators have it the wrong way around when they are wanting to live off their art.
In most cases, artists don't make it big at the start of their artistic career. Going into comic making or commissions and straight away thinking that you can support yourself without already having that income to start with is a really unwise move. This leads to people feeling that they are not getting anywhere with their work since they have set too high of a goal too early.
If you are going to make a living off your work, you NEED to already have people pledging to you/commissioning you with enough money to be able to live off.
Now, please don't think I am being mean @Rootbeer_Jewels cause this is coming from my own personnel experience. Don't put all your eggs in that basket of living off commission work or any artistic work for that matter.
It is an over saturated market, where people charge almost nothing for their work (which ruins it for themselves by overworking to gain enough money to live off and for everyone else cause they have to compete against those unrealistic prices) and nearly everyone can do it (which again, makes it harder for anyone to get a foothold).
Personally, I study to be a Zoo Keeper for 3 years. I am qualified to do so, but there were no jobs. Why? Cause everyone wanted to become a zoo keeper and it was easy to study, so the field was impossible to get into. Sure I could have worked in the zoo kiosk and wait for a position to pop up, but so were the 20-30 other people working there.
I it took me years to get other skills to make me more desirable to be hired into another job, cause I didn't think of a back up plan to fall on when things went south.
I guess the point of this rant is to have a back up plan. Get a job (full time is fine, most of us older creators have full time work or work similar hours and still get our stuff out) that you like and enjoy, or at least an tolerate. Because ultimately you will need a job. You'll probably need to live in your own place eventually, buy all your own meals, pay for a car and fuel, website and phone bills and everything is needs money that art stuff can't completely cover.
Still work on your art, and definitely try and make it something that you can live off. I am in no way saying that doing is a bad move, but don't throw away other opportunities in pursuit of that dream.
As my Dad used to say to me, "The job you are doing now isn't the thing you are going to be doing for the rest of your life."