It rocks when you get those clicks, my highest has been about $12 and it shocked me. I wish they were more often, but it was most likely a short timer advertiser that dumped a large ad budget in or set there cpc to high to try to get a lot of traffic, but it is not sustainable for most advertisers. Keep building your site and you will see your earnings grow.
I would not quit your day job just yet. Instead, keep working and improving your adsense earnings. Maybe also use another advertiser as well as adsense. Once you reach $800 dollars per month, I believe this would be a good time to quit your day job. Good luck.
You can know the keywords that are driving clicks to your Ads by integrating your Adsense account with Google Analytics You can get an idea at http://searchengineland.com/google-analytics-adds-adsense-integration-18308
You need to wait for some more time to leave your current job. Keep continue your present job and online work from home for your blog. Once you got regular and good revenue from online source, then you can settle it down. Ads and clicks are not standard though it has good potential and future growth.
Congratulations, my best click only 8$ , I think you get click from the Best keyword and Click Locations
Congrats, keep it up. But don't quit your day job, keep this new income stream as an additional income channel.