There are some awesome guides available at http://www.spinfarming.com/ that you should check out if you're interested in turning even a small portion of land into a mini farm. SPIN stands for Small Plot INtensive, and people in various urban and country settings are putting these precise methods to the test, making tens of thousands of dollars off their sub-acreage. Need to know where to get supplies? They'll tell you. When to plant your seeds? They'll tell you. There's a wealth of information available, and it's just what we need to get our mini farm operation "off the ground". Hehe!
There are guides that lay out how much land you need based on a certain crop to make a minimum income. For example, the Flowers Specialty Farm tells you how to make $33,750 in gross annual sales using only 6,500 square feet. That's less than 1/6 of an acre! Garlic is another good money-maker at $23,250 on 6,000 square feet. This information has the potential to transform the way we live, improving our quality of life and connecting us to the land we've grown apart from for so long. Learning to work with nature instead of against it is surely the way forward - we just need to know how. SPIN Farming seems to be a great companion in this endeavor!