#1- First aid kit stuff: Mercury or Digital Thermometer,Anitseptic Wound Cleaner
(i recommend Betadine- just be careful as pure Betadine can sting a little), Scissors, Self Sticking Bandage (I recommend VetWrap), Antiseptic Cream or Ointment (I LOVE
Wonder Dust, it keeps away flies and prevents infection), Epsom salts (for drawing out infection, when mixed with water of course), Gauze, Cotton Balls Sponge or Cloth (for cleaning wounds and applying wound stuff, if you use a sponge or cloth make sure you have two, one for cleaning wounds other for applying wound stuff), Notebook (for recording any emergencies that happen, your horses normal temperature, respiration, etc, and your vet's number), small first aid horse book, Hoof pick, Banamine, Bute (Phenylbutazone).
#2- A ceiling should be 12 feet for a horse. PLEASE don't store hay in a loft. There is so much risk of fire, and since you are building a barn, and have the choice, just make a smaller building at least 50 ft away from the barn.
#3- I recommend having a separate manure pile for bedding, to speed up composting time for manure, and create a better compost. I would recommend 4 piles. 1 you currently add manure to, 1 currently composting, and 1 almost/all the way composted, and 1 for bedding.
#4- I assume you are meaning dirt floor for stalls- not arena right? If it is the outdoor arena, you will most likely not end up riding most of winter due to mud. Dirt in the stall is high maintenance. Make sure you add LOADS of extra bedding to help prevent mud in stall. Rather than adding sand to stalls, I would get mats. Way better for the horse, cheaper in the long run. Or if you don't get mats, get some of the road base rock (the big chunky stuff) and make sure it gets REALLY into the soil, and add bedding over that. Please don't use sand - it can get ingrained in a horse's hoof, and cause lameness... And it takes a LONG time to get rid of to.
Please feel free to message me if you have ANY questions
Oh, and welcome to the board!!