Wow Redline, that amount of space would be a dream come true for me! We had to sideline our dream of a smallholding for our jobs, plan being we buy one a little later on in life before retirement.
My plan on that kind of area would be dependant on how much you want to learn and the amount of time/money you want to then spend on it.
As a chicken keeper, that's the first thing I would get on there. The obvious result is eggs, our batch of 20 chickens give us around 5 eggs day in winter and about 15-20 a day in Spring/Summer! We also have a cockerel and some very good broody hens, so we have our own supply of chicks, with roughly half of them being cockerels they get used for meat when of age.
What you also get from chickens is endless hours of entrainment! We found it's something the kids love to get involved in, the chicks are an amazing thing for them to see hatch and grow. Cost would depend on your budget, but they can be fairly low cost, but if you have some money to spend, get some plastic coops and a very safe area for them by means of fences etc. I know a lot of people who have found a happy medium with that amount of land, by having them run free in the day but have a safe area for evenings and bed time. Ours get free run of the fruit orchards, and every few years the lawn to feed and aerate it. We also compost all the chicken house hay/shavings and poop, I use a pallet compost system that produces a lovely amount of chicken compost every year, even through winter it's not hard to have hot composting on the go.
Fruit trees! Easy in the bigger plan of things. Again in you have the budget, get to a specialist or a nursery with knowledge of soil types, growing condition etc. They should set you on the right path for the right fruit, the right variety for cross pollination and so on. In ours we already had two 100 year old apple trees that we pruned heavily and survived, we've added another six apple, four cherry, two plum, two damson and a couple of pear trees.
As we needed seed our whole lawn, we actually took 1/3 of it away for wildlife. We planted around 6 fruit trees and then made a few wood piles of old apple, beech conifer wood. It's already home to a hedgehog and some toads, but as we leave it be, we're not sure what else has taken residence there. We ordered all our seed from Boston Seeds as they came highly recommended. That's where we also bought all our wild flower seeds, it's only about 100msq but it looked amazing come Summer, and we had all sorts visiting. You pick the seeds that suit your soil and location, since we have terrible waterlogged clay soil, that's what we got.
As we had an overgrown plot, we had to take down about 15 very large conifers, replaced by a 1000 native hedge whips, now have a near working hedge, so if you want to have borders to any of your lands, get them down sooner rather than later!
Due to the waterlogged nature of one part of the garden, we might start a wildlife pond, again it's finding the time with two kids under 2! If you can have a safely fenced one, again a very good nature attractor.
If I had the time and some second hand equipment bees would be first on the list.
If we had the time and land, a pigs would be next, if you have land you want clearing get rearing!
Sheep if you want the grass cut.
I think it's 10 acres you need for a sustainable woods to keep a home warm with wood, but that would take some years to start and then maintain.
From a veg point of view. We built a raised bed, sadly it was brilliant for a couple of years, but we stupidly let the raspberries take over. I've started a fresh this year, and will leave it until next year to use again. We have just bought a second hand 12 x 8 greenhouse so we have that to use. Currently have 6 different rhubarbs, three gooseberries, two dwarf pears on the go, and some random mixture of herbs that I'll start a fresh with. Every year I'll grow broad beans, courgettes, tomato and maybe something new. With the greenhouse in place I might start some grapes.
Here's just a few photos
https://www.amazon.co.uk/photos/share/jOVlHhBCsWKHRlib4wXBxXzWS9KPd2jJy8sQTZ2EMqF
https://www.amazon.co.uk/photos/share/zZSnyXQwto9R0BjDIHhJ6x2ZEBmi9XrbPQ9hKSJkxfr
https://www.amazon.co.uk/photos/share/bQnOe5nnIje8inCwfZRtaeVknnM2sea2DVuRVIPoyqk
https://www.amazon.co.uk/photos/share/iVO7OVGgPA38qIQwoamzecuJkTZYXJADzE606leBpXo
