As above, do not do this, it’s madness.
I got my first horse after 10 years of riding, it was still a massive learning curve and I had to keep her at a livery yard with knowledgeable people on call all the time. About 10 years later I started keeping the horses at home, yet another massive learning curve.
Horses can quickly get out of hand if not handled and exercised properly. Even a small pony can cause a lot of problems, breaking away when led, rearing or kicking at you, going through fences, or running loose while you struggle to catch it. Welfare wise horses need a knowledgeable owner to notice first signs of a health problem, manage their living conditions, and even for daily care. Finally, they are extremely expensive animals to keep. Just the basics, farrier, vaccinations, worming and dentist will set you back, plus the land has to be managed for them, e.g. fencing, poo picking, ragwort clearing, shelter, etc. and you will need a house sitter experienced with horses every time you go in holiday.