I am a mother of 5 also (our youngest is 19, oldest 27). We are mostly empty nest now. One son at home and the youngest is away at college. We have a small farm and have our own garden, raise our meat, have the misc farm animals and a couple Jersey cows.
I have a friend who is a small natural farmer - CSA. http://allweneedfarms.com/
You might look into becoming a CSA farmer. (Community Sustained Agriculture). It works well for her. http://www.localharvest.org/csa/http://en.wikipedia.org/wiki/Community-supported_agriculturehttp://www.nal.usda.gov/afsic/pubs/csa/csa.shtml
My best advice is to find your farm and buy it, even if you are not ready to start your business. The reason is that if you wait a couple of years to get it, your dollar will not go as far. Something else to think about is that if you decide to have a "pick your own" business, check into liability insurance. Since it is a business, it would be different than a regular homeowner's policy.
The little expenses can add up quickly.