Hi, we stay in the Scottish Borders, have 9 acres and rent another 6 or so. Enough to do all the things I want, have sheep (about 20 odd), goats (3 and 3 kids), numerours chickens (meat and eggs) and we raise weaners over the summer. Still establishing large veg/fruit garden and have large polytunnel (very useful things). We don't run this as a business, and my OH works full time in Edinburgh. I do the smallholding and children. If you have more than 5 acres you would need to consider some machinery, we bought a tractor and topper, harrow and rotovator. Just means we don't have to get contractors for everything. Oh an dlook at fences when you look at property, very expensive to start from scratch/repair.
Also start with poultry and then move on to pigs (weaners for meat) and maybe sheep/goats. We did one species per year.
We are selfsufficient in meat, eggs, most veg (well you cant grow enough tatties to last the whole year...), some fruit, honey (3 hives in the field) and hopefully soon in milk (and some cheese, yoghurt etc). I also get all the wool (and much more than I need actually) from my sheep for my hobby (spinning, knitting, weaving...)
I have thought a lot about trying to run our holding as business, but having given up the rat race I just can't stand the thought of going back into it, and it would mean that I have to give up some parts of the holding to concentrate 100% on the business. I just think of it as our way of life, and don't miss holidays. Who would want to fly with the current restrictions etc in airports...