I'm sorry, but I think this is a non-starter on several grounds.
1) Planning Permission. Are you buying a field or renting it? Having found your field, then approach the planning authority to enquire about change of use. It will cost a �300 application fee, even assuming it may be possible.
2) Requiring donations to set up a business venture for your benefit. One either gets a lender to loan you money which you pay back with interest (difficult in the current economic climate), or one sets up a company with shares so the financial backers share in the risk / reward.