EDITED:
Well, if you are building on some of it depends how much that takes up. The rule of thumb is a horse per year acre but you must split it up so parts can grow and you can rotate them. I am not sure about Alberta but here is about what you I'm thinking
barn- about 30,000
Indoor arena- 80,000-100,000.000 It really depends on how nice, heated usually makes it more spendy. A indoor arena is just like a house and costs are similar.
You need a farrier vet and trainer ( if you plan on riding)
Wood fencing is not the best choice ( I have found) It looks GREAT but it stains easy ( hard to clean) the horses eat it. it rots and cracks. Invest in metal or wire fencing
hay in America cost between 5-8 dollars depending on the quality DO NOT get cow hay, ever!
You will need grooming supplies ( brushes, hoof picks, water slickers, shampoo conditioner curry combs etc) wheelbarrows, rakes, scooper's, bedding ( shavings), water buckets, emergency kits ( horse and human) water trough, horse tack ( saddles bits blankets etc) and alot more but I cant think of it right now
oh your a 14 year old girl( not being rude!!!! :) )... ya not sure you can afford this. Your looking at about 600,000 to 1.8 million or more.... if you want a indoor arena, stable, nice fencing and all new grooming and supplies. But who knows maybe your a milliner :) To save money you could get a outdoor arena and just have lights outside and you could forget the " barn" ( what you are talking about it more like a stable) I mean they are nice but you really dont need them. You could just put a washing area ( if you get a indoor) in the arena and get 3 panels and put them up in a square against the walls of the indoor arena. This can work as a emergency stall or all the time stall if you have the room. Just make sure your horse/horses have a shelter and you have blankets for when it gets cold. Hope this helps and good luck