well it really depends on alot… if the horse can graze alot u dnt need as much hay or grain. and it also depends on if the horse is in a stall or at pasture…. but in california hay is anywhere from lk 6-9 dollars 4 horse hay and grain is at least lk 10- 15 dollars a bag. i dnt no the exact cost per year or month( i dnt keep track myself) i usually dnt feed during summer they jus graze but i feed my old mare.then i feed both my horses hay and grain during winter. i dont stable my guys so i dont kno a whole lot bout that. idk if u want lk a list of wat u need and wat it costs but ill list some of the basic stuff not counting ur property..

horse: from lk a couple hundred to several thousand
halter: 15
lead rope: 10
i suggest u jus get a grooming kit with all ur brushes and a bag, lk 20-50 dollars
saddle:200- over a thousand(for western, u could get a cheaper one to start with then get a better one later)
headstall:at least 40
bit 10-15
reins 10-100

and theres your vet and farrier bills that can get really pricey…. I paid 100 dollars for a vet to walk out the door, look at a horse and say shes fine go home and walk away!!! and i hauled the horse there!

any way good luck

it's a hard question because each state is differ ant
you might be looking at around 500 to 700 maybe at that.but you will first need the city to come and look at it and then they will tell you what is need to pass the house and all your work.