You're really helpful! (that sounds sarcastic, but I'm not joking!)I'll try to take a stab at budgeting. My caveat is much like the other poster's---a lot depends on your individual circumstance.
With having seven acres, you will most likely need to supplement your horse's pasture with hay and perhaps grain. The absolute ideal acreage formula for horses is 5 acres per horse. Now, that doesn't mean you can't manage on less, but you will have to plan and manage very well. I would try to find some literature on small scale equine management.
You don't live super far from me, so I'm going to guess that hay prices aren't really going to be much different. Look at $4.00/bale for quality horse hay. You may be able to find some cheaper or some for a higher price--but really, I don't want to argue semantics--I'm just trying to give you a base budget. And another rule of thumb is to figure on 100 bales of hay per horse to put in your barn for the year. Now, I always like to have extra and think 200 bales per horse would be ideal.<----that's just my type A personality coming through though.
Some horses do perfectly fine with quality hay and have no need for grain. However, some need a little extra help. You'll find many types of feeds and will have to pick which one your horse needs, if any. I think the more budget friendly feeds cost about $14.00 per 50lb bag. You'll want to feed by weight and not volume. That will greatly help you with budgeting and planning on how much feed to buy. Let's say your future horse eats 4lbs of feed a day--one 50lb bag of feed should last you 12 days.
You may want to keep your horses in a stall during the night, and out during the day--and then reversed in summer. Or, your horses may live out and have a simple run-in shelter. I currently have both situations on my farm. I buy bulk shavings and pine pellets about every 1 and half months. You can get a discount for bulk buying. It's about $370.00 for 30 bags of pellets and 20 bags of shavings. That's for 3 horses that are in stalls.
I prefer the Veterinarian to give any vaccinations. He's more practiced and knows his product like who manufactured the vaccine, where it came from, how it was handled. Vet call is about $65.00 per visit.
Now this is just to give you an idea...your area will greatly depend on prices but this can give you a base trajectory going forward. I wish you all the best and hope you enjoy your new horse adventure!
When I lived in TX, Timothy went for $25.00/bale! The Northeast is a hard place to live, but hay sure comes cheap compared to other places. Many farms here make their own hay which keeps hay cost down--you don't have to travel too far for excellent hay. For example, I'm lucky enough that my great uncle lives right across the road and makes superior hay. Making my own hay is actually a future goal of mine since most of the farmers are getting older and unable to do it anymore. I'm looking forward to being self-sufficient.
Bales here are 3-wire and about 100 pounds.