A belated welcome Sparrow, I too must have missed your original post, but your ideas sound interesting. Do you mean 2 acres plus woodland?
Goats are often suggested to clear woodland, but they would kill everything by stripping the bark, and some plants may be poisonous, and if bramble there, thorns can cause problems, so maybe best hacking some of that back and clearing it first? Then animals will eat any regrowth. But there again, some bramble have nice fruit ?. And clearing woodland may not go hand in hand with nature conservation ?
A place near us I think we're pioneers of aquaponics, linked to a school for educational purposes, been on the go for years, but I don't think it worked as well as they hoped.