Two issues I would think about are your horse’s welfare and your budget. Think about your philosophies on adequate horse care, including feed, environment, and social needs.
Feed: even boarders (including me) may end up buying their own feed, partially or wholly. Budget for that and investigate that issue when you look at boarding establishments. Budget for salt/mineral blocks (cheap) and supplements (expensive).
Environment: I think daily turnout is important. Obviously, safe, sturdy barns and fences are necessary. Shelter needs vary by region and your shelter needs may be more elaborate than the horse’s. It’s nice for you to have a comfortable grooming/bathing area, nice tack storage, and a place to sit/lounge at the barn, but that doesn’t affect your horse’s comfort.
Social needs: Since this will be your horse which you will have total responsibility for, I assume you want it to be happy. If you are able to be at the barn every day you will fill some of your horse’s need for social bonding. But if you will be riding only on weekends and your horse is alone the rest of the time, think about its companions. Will he have turnout with other horses? Will he have a companion/neighbor to stand next to at his paddock fence or a friend in an adjacent stall? Horses are gregarious animals and their social needs are important. It is kind to consider those needs.
You haven’t mentioned finances, so I will assume you are like the rest of us in that money matters.
Monthly Fees. Include board, extra feed and supplements, farrier, annual vet (shots, teeth, routine physical), and your lesson fees in this category.
Savings Buffer. Make a savings account or empty credit card (obviously, savings is better) for emergencies. My ideal emergency budget for a horse to use for trail riding and some lessons would be as follows:
-boarding, six months
-three rounds of shoeing
-$1000 for emergency issues (medical, unexpected tack replacement, euthanasia)
-horse’s medical insurance, six months (if applicable)
-riding lessons, six months
Tack, Equipment, Grooming Supplies, Medical Supplies, Storage Containers. Start shopping now. You will want to wait on the saddle (the big ticket item) until you get the horse, but start shopping to figure out what you like and budget for it. I could write a whole post on tack items, but I won’t, partly because I’m not as well-versed as others in the stuff to have for shows, but someone should make a list. Also, some of the equipment will vary depending on the barn. You might not need your own water buckets, feed tubs, or manure rakes, for instance, but you will need your own brushes, curry combs, and hoof picks. And bug spray and fly boots and shampoo and de-tangler and… The good thing is that you can buy a lot of this stuff as you need it.
Good luck!