I have a horse on a DIY yard and I would never have my own land. Too much hassle.
Below are absolute basic considerations to think about as an owner:
Basic costs:
Stable, water, electric, trailer parking: £152 a month (you obvs would only pay for water and electric)
Bedding: £48 to set up stable, £48 a month thereafter (one bale a week)
Feed and supplements (my horse has arthritis): approx £40 a month
Hay in winter (4 small bales a week): £90 inc delivery a month
Shoes full set every 6 weeks: £75 (next time I’m having a barefoot horse, much cheaper)
Basic routines:
Winter - visit twice a day to feed, muck out, put in field, bring in later, ride 4 days a week. Often very muddy off the immediate yard around the fields, need decent wellies, coats etc.
Summer - visit once a day to field check and feed, ride 4 days a week. Bring in if too hot, therefore two visits a day and need to muck out.
Riding:
I learnt in a school 4 years of lessons, loaned horse then bought her after 18m. I can jump competently and school a horse myself after 3 years owning.
We have fantastic hacking around and an outdoor school.
Considerations for you:
If running it as a DIY livery yard, you may have to pay business rates. Constant water supply is essential both on the yard and in fields. What happens when the pipes freeze in winter?
Where would the horses on your yard be able to ride? Nearby hacking away from busy roads is a basic essential.
Where will your muck heap go? How will you manage this / may need to have it taken away.
Field management - rotation, harrowing if not poo picking, rolling, fencing, water supply in fields.
Horse health - ensuring your liveries test for worms or have a worming programme, what happens if a horse is injured and the owner is not there (horses are SO fragile for their size, it’s untrue!)
DIY Liveries - even if only 5 horses there will be quite a bit of coming and going, you might be ok with this around your home or see it as disturbance.