If you’ve no experience of growing or of livestock, I would say go and get some experience first, to at least make sure you like it, before getting yourself committed at home. Have a look at WWOOF UK, lots of hosts all over the UK (and all over the world through the worldwide organisations) who will be glad to have a bit of help and show you what they do.
Also, see if there is a smallholder association in your area, lots of these about, they often have monthly meets at members’ holdings, so it’s a great way to see a bit of what can be done and make some friends who can advise if you do decide to have a go.
An acre is a good size for starting, extra acres would be a lot of work if you are growing but essential if you want livestock more than a few hens and maybe a couple of weaners to fatten up each year, or a couple of orphan lambs to rear and put in the freezer each year.
If you’ve come at this more from wondering how you are going to tame your patch now it’s got away from you, rather than from having a passion for growing, or for livestock, or for eating your own food, then you may be better off finding some local folks who could do something with the ground - maybe put a couple of pigs on it this year to get it cleared, then some sheep next year to even the ground out again after the pigs have rootled it. Again, the local smallholders would be the place to start.
But if you think you may have a passion, then doing some WWOOFing should help you decide if you do, and if so, for what. (Just try not to fall in love with cattle, you’d need more than 5 acres to do cattle properly
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