This is an old post, but anyway..someone might read it in the future.
Like gamecorpstudio said: don't quit your day job, for 2 reasons :
1. As a beginner you will not earn enough
2. You will loose interest and focus if you work on your games everyday, all day long. Instead hate your boss and your job and this will keep you motivated to get home, work on your games until 3 AM, sleep 4 hours, go to your job, hate it more, go back home after office hours and you will be even more motivated to work on your games and learn new skills
There are 2 kinds of game developers
1. The type that creates 1 game avery 1-2 weeks and get a small return from each game
2. The other type that expect to earn $$$ with every single game they make...developing month and months on each game
I think you should start making number 1 until you get a a decent earning to pay your bills, then when you have more experience go to number 2 and create the next Angry bird or whatever
[Edit] I am the type 1, I use only Android + AdMob at the moment and get $0.75-$1.5 /day from each game, but I know this is not the best way of being a game developer since this technique will saturate te market quickly with poor quality games