Horses do not like to live alone, so no two horses cannot live comfortably on one acre of land. It will be a total muddy mess in about a month and a half, the Perch alone give it three months.
You can use a three sided shed, the wall facing towards the harsh wind.
You need a draft size halter as well as any other tack needs to be draft size as well.
Horse ownership is a big commitment, you need to be knowlegable, as well as a big out flow of cash. Think before you jump in.
The best time to plant a tree was 20 years ago, the second best time is today.