If the farm is about 20 acres, I don't know if there's a living in it in conventional agriculture- ie Cattle, sheep, dairy etc. What kind of farming was your uncle in? In relation to organic farming, or niche areas such as unusual meats and so on, I'm afraid I have very little knowledge, but there are organic farming organisations out there- I'd imagine you would have to research this very thoroughly and do a course or courses before even thinking about getting into it as a fulltime occupation. AFAIK to become organic the land has to be organically farmed for a certain length of time-so there may even be a certain lenght of time before you could even qualify; I really don't know much about it.
Ubiquitous, I make no claim to BE a farmer and have no wish to ever be one!However I think I can say with confidence that I have about as much experience of farming as it is possible to have without actually being one. That is to say I was born and reared on a farm, and with the exception of months away at college and a day job, lived on a farm for far too many years, and still help out, both practically and with the dreaded form filling.
Your experience of farming is obviously very different to mine- I've never heard of stock being stolen ( and with the department identity regs, can't see it starting), and as for machinery, well the average farmer here just wouldnt have the kind of large new and expensive machinery that would be targeted. This would be the preserve of contractors. In relation to feed, and dealers, I'll accept what you say- i.e that there can be problems.
Getting back to the poster- all I can say is that farming is not something that I would want to do- I think its a tough 24 hour, 7 day a week job, and unless you get into a niche, its impossible for a small farmer to make a living for a family. Of course, around here, what happens is that small farmers take on a day job ( and marry nurses and teachers!) because they have to. But there are good bits too. As Ubiquitous said, you really need to know what you're doing before you do anything rash. Is it possible for you to take a career break and try it out? But even before doing that, you should really take professional advice and think about doing a course.