Concerning your questions regarding business planning please contact the Small Business Development Center in Champaign. Al Luchetti is the director there and is familiar with the needs of small farm enterprises.
For soil testing I would suggest you take a sample to either the coop in White Heath or FS in Monticello. There are also a couple private soil testing labs in the vacinity.
The U of I Agro Ecology website is a good source of informaiton concerning organic information. http://asap.sustainability.uiuc.edu/org-ag/
These U of I Extension sites might also be useful:
Small Farms: http://web.extension.uiuc.edu/smallfarm/
Agritourism: http://web.extension.uiuc.edu/agritourism/