Even if you own your own home, you typically still have to pay taxes. You may have to earn some income if you don't have money saved up for your taxes, so you'll probably have to pay income taxes as well.
Bottom line, it's difficult to fully opt out. But what you suggest is not a bad start.
http://www.trulymovingpictures.org/festival-years/2010/movie...
Linked is a review of the movie Zero Currency, about a former social worker who stopped using money or barter. Disclaimer: I haven't seen it.
A good place to start would be to own your own home, aggressively invest in solar energy, and grow your own food.*
All that's pretty expensive though...maybe you could go work in finance and save up?
*3D printing might also be worth a look for some items.