With enough start up capital anything will work... for awhile.
In your demographic, will the area support such an endeavour?
Will you have enough students?
Will they be able to afford this academy?
Will you have qualified instructors and be able to pay them?
Will you have a nurse/health care professional on hand?
Can you attract qualified equine instructors?
Have you thought about liability insurance? Building insurance?
Do you have a local vet and farrier to keep these horses in tip top condition?
Do you have a hay, feed and bedding supplier?
Will you have a certified dietician for your cafeteria and enough staff to prepare, serve and clean up the meals?
You will also need management skills, do you have a business degree or equivalent?
Have you set up an advertising budget?
You will need an accountant, clerical staff and some kind of benefits package for your employees (to attract them and keep them).
You will need to keep payroll, accounts, invoices, etc.
This type of endeavour combines the headaches of personnel management, equine management, training, a boarding house and food services.